121

High Speed

Fuses

High Speed Fuses

Section Contents

Page

General Applications . . . . . . . . . . . . . . . . . . . . . . .122-123

North American fuses & accessories . . . . . . . . . . .124-141

DFJ - High speed Class J fuse  . . . . . . . . . . . . . . . . . . 125

Square Body fuses & accessories  . . . . . . . . . . . . 142-213

BS 88 fuses & accessories . . . . . . . . . . . . . . . . . .214-222

Ferrule fuses & accessories. . . . . . . . . . . . . . . . . .223-243

TM

Scan this tag to get the

latest product information for 

High Speed Fuses.

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Power Factor

For other power factor
values, the total clearing
integral can be
calculated as a multiple
of the clearing integrals,
the correction factor K
and the correction factor
X.

Arc Voltage

This curve gives the
peak arc voltage, UL,
which may appear
across the fuse during its
operation as a function
of the applied working
voltage, Eg, (rms) at a
power 
factor of 15%.

Power Losses

Watts loss at rated 
current is given in the
electrical characteristics.
The curve allows the 
calculation of the power
losses at load currents
lower than the rated 
current . The correction
factor, Kp , is given as a
function of the RMS load
current, Ib , in % of the
rated current .

Cut-Off Current

A fuse operation relating to short-circuits only. When a fuse
operates in its current-limiting range, it will clear a short-

circuit in less than 

1

⁄

2

cycle. Also, it will limit the instantaneous

peak let-through current to a value substantially less than

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122

High Speed Fuses

Prospective Current in Amps RMS

Peak Let-Through Current

10

2 

≈

 10

2

2

10

3

10

4

10

5

10

3

10

4

10

5

10

6

A

B

General Applications

Rated Voltage

The AC voltage rating of Bussmann fuses is given in volts
rms. Fuses tested to IEC are tested at 5% above their rated
voltage. British Style BS 88 fuses are tested at 10% above
its rated voltage. UL recognition tests are performed at the
rated voltage.

Rated Current

Rated current is given in amps rms. Bussmann fuses can
continuously carry the rated current.

Melting Characteristic

The melting
characteristic
shows the virtual
melting time in
seconds as a
function of the
prospective current
in amps rms. The
fuses are specially
constructed for
short-circuit
protection against
high level fault
currents. Loading
and operation of
the fuse in the non-
continuous/dashed
section of the melt
curve must be
avoided. The curve
can also be read
as the real melting
time as a function
of the RMS value
of the pre-arc current.

Clearing Integrals

The total clearing I

2

t at

rated voltage and at
power factor of 15% are
given in the electrical
characteristics. For
other voltages, the
clearing I

2

t is found by

multiplying by correction
factor, K, given as a
function of applied
working voltage, Eg,

(rms).

10

4

10

3

10

2

10

1

2

2

4

6

8

2

10

2

2

4

6

8 10

3

2

4

6

2

6
4

10

0

2

6
4

10

1

2

6
4

2

6
4

2

6
4

6
4

2

6

2

4

Prospective Current In Amperes RMS

Vir

tual Pre-Arcing 

Time In Seconds

10

–4

10

–3

10

–2

10

–1

K

1.5

1.0

0.5

0.4

0.3

0.2

100 200 300 400 500 600 660

E

g

1.0

0.9

0.8

0.7

0.1

0.2

0.3

0.4

0.5

     COS 

␸

X

U

L

1.4
1.2

10

3

6

8
7

9

5

4

3

200 300

400

500

600 660

E

g

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

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123

High Speed

Fuses

General Applications

that obtainable in the same circuit if that fuse were replaced
with a solid conductor of equal impedance.

A asymmetrical current
B symmetrical current

Parallel Connection

When fuses are connected in parallel it is recommended that
the applied voltage does not exceed 0.9 UN (the rated 

voltage of the fuse). This is due to the fact that the energy
released within the fuses may be unevenly shared between
the parallel connected barrels.

When fuses are connected in parallel, one must take into
account that the current sharing is not necessarily equal. And
it must be checked, that the maximum load current is not
exceeded.

Series Connection

Fuses in series may not equally divide the applied voltage. It
is recommended that series connected fuses should only be
operated at fault currents that yield melting times less than
10 ms and a recovery voltage per fuse of less than or equal
to 0.9 UN (the rated voltage of the fuse).

Mounting Guidance

The recommendations below have to be followed when
mounting a Bussmann fuse with end plate threaded holes.

1. Screw in studs: 5 N•m Max, 3 N•m Min
2. Attachment of the fuse to bussbar by means of nut and  

washer:

Thread

Torque (N•m)*

Configuration

Max

Min

5

⁄

16

” – 18, M8

25

20

3

⁄

8

” – 16, M10

45

40

3

⁄

8

” – 24

45

40

1

⁄

2

” – 13, M12

65

50

1

⁄

2

” – 20

65

50

*1 N•m = 0.7375 lb-ft

Overloads

The design of Bussmann fuses is such that they can be
operated under rather severe operating conditions imposed
by overloads (any load current in excess of the maximum
permissible load current).

In applications, there will be a maximum overload current,
Imax, which can be imposed on the fuse with a 
corresponding duration and frequency of occurrence.

Time durations fall into two categories:

1. Overloads longer than one second
2. Overloads less than one second termed “impulse” loads.

The following table gives general application guidelines
which, in the expression Imax < (% factor) x It. It is the 

melting current corresponding to the time “t” of the overload
duration as read from the time-current curve of the fuse. The
guidelines in the table below determine the acceptability of
the selected fuses for a given Imax.

Frequency of Occurrence

Overloads (> 1 sec)

Impulse Loads (< 1 sec)

Less than once per month

Imax < 80% x It

Imax < 70% x It

Less than twice per week

Imax < 70% x It

Imax < 60% x It

Several times per day

Imax < 60% x It

—

When impulse loads are an intrinsic/normal parameter of the
load current either as single pulse or in trains of pulses or
when their level is higher than the melting current at 0.01
seconds (per time-current curve), contact Bussmann for
application assistance.

In addition to the parameters set forth in the preceding table,
the RMS value of the load current as calculated for any 
period of 10 minutes or more should not exceed the 
maximum permissible load current.

Furthermore, it is important that a fuse should not be applied
in the non-continuous/dashed portion of the associated 
time-current curve.

Any time-current combination point which falls in the 
non-continuous/dashed portion of the time-current curve is
beyond the capability of the fuse to operate properly.

DC Operation

Depending upon the short-circuit time constant and the 
magnitude of the prospective short-circuit current, the dc
voltage at which a fuse can be applied may be less than its
ac rating. Long time constants require a lower dc voltage.
Conversely, however, higher available prospective short-
circuit currents result in faster fuse openings and thus permit
a fuse to be operated at a higher DC voltage.

Consult Bussmann for
additional information and
application assistance
when fuses have to 
operate under DC 
conditions.

Load Current Versus

Conductor Cross

Section

Reduction of permissible
load current when the conductor cross section is less than
that given in IEC Publication 269-1 & 4 valid for Bussmann
high speed fuses.

Application Assistance

If you have application problems or need a fuse outside our
standard program, please contact the nearest Bussmann
representative. Phone numbers are shown on the back
cover.

1 . 0

0 . 9

0 . 8

0 . 5

0 . 6

0 . 7

0 . 8

0 . 9

1 . 0

≈ (IEC cross section)

Reduction Factor

High Speed Fuses

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Introduction

North American Contents

Catalog

Amp

Number

Volts

Range

Page

DFJ

600

1-600

125

FWA

130

1000-4000

126-127

FWA

150

70-1000

128-129

FWX

250

35-2500

130-131

FWH

500

35-1600

132-133

KAC

600

1-1000

134

KBC

600

35-800

135

FWP

700

5-1200

136-138

FWJ

1000

35-2000

139-140

Accessories

Fuse Bases

141

North American Fuse Ranges

Amps

Volts

AC

DC

1000-4000

130

X

X

70-1000

150

X

X

35-2500

250

X

X

35-1600

500

X

X

1-1000

600

X —

5-1200

700

X

X

40-600

800

—

X

35-2000

1000

X

—

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124

High Speed Fuses

North American Fuses

General Information

Bussmann offers a complete range of North American blade
and flush-end style fuses and accessories. Their design and
construction were optimized to provide:

•  Low energy let-through (I

2

t)

•  Low watts loss
•  Superior cycling capability
•  Low arc voltage
•  Excellent DC performance

North American style fuses provide an excellent solution for
medium power applications. While there are currently no
published standards for these fuses, the industry has
standardized on mounting centers that accept Bussmann
fuses.

Voltage Rating

All Bussmann North American style fuses are tested at their
rated voltage. Bussmann should be consulted for applications
exceeding those values.

Accessories

External and internal open fuse indication is available for
selected portions of the North American line. Fuse blocks are
available for most applications.

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125

High Speed

Fuses

High Speed Fuses

Specifications
Description:

High speed, current-limiting fuse. The

Bussmann Drive Fuse will provide maximum protection for
AC and DC drives and controllers and meet NEC

®

branch

circuit protection requirements. The Drive Fuse has the 
lowest I

2

t of any branch circuit fuse to protect power 

semiconductor devices that utilize diodes, GTOs, SCRs and
SSRs.

Dimensions:

See page 21 for Class J dimensions.

Construction:

Melamine tube with silver fuse element.

Ratings:

Volts — 600Vac (or less), 450Vdc (or less)

Amps — 1-600A

IR — 200kA RMS Sym., 100kA DC

Agency Information:

CE, Std. 248-8, Class J, UL Listed,

Guide JDDZ, File E4273, CSA Certified, Class 1422-02, File
53787.

Features and Benefits

• Easily coordinated with existing and new variable speed 

drives and electric controllers.

• Standard Class J dimensions allowing the use of readily

available fuse blocks, holders, and switches.

• Allows the lowest let-thru energy of any branch circuit 

overcurrent protective device.

Typical Applications

• Protection of AC and DC drives
• Equipment using power semiconductor devices

Catalog Numbers (Amps)

DFJ-1

DFJ-15

DFJ-70

DFJ-225

DFJ-2

DFJ-20

DFJ-80

DFJ-250

DFJ-3

DFJ-25

DFJ-90

DFJ-300

DFJ-4

DFJ-30

DFJ-100

DFJ-350

DFJ-5

DFJ-35

DFJ-110

DFJ-400

DFJ-6

DFJ-40

DFJ-125

DFJ-450

DFJ-8

DFJ-45

DFJ-150

DFJ-500

DFJ-10

DFJ-50

DFJ-175

DFJ-600

DFJ-12

DFJ-60

DFJ-200

Data Sheet: 1048

DFJ Class J

Drive Fuse High Speed Fuses

Time-Current Characteristic Curves—Average Melt

Current Limitation Curves

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126

High Speed Fuses

Dimensions - in

Catalog Number

Fig. B

C

D

Thread Depth

FWA-1000AH-2000AH

1

2.0

1.0

—

Tapped 

3

⁄

8

”-24 x 

1

⁄

2

”

FWA-2500AH-3000AH

1

3.0

1.5

—

Tapped 

1

⁄

2

”-20 x 

1

⁄

2

”

FWA-4000AH

2

3.5

1.5

1.5

Tapped 

1

⁄

2

”-20 x 

1

⁄

2

”

1mm = 0.0394˝ / 1˝ = 25.4mm

Fig. 1: 1000-3000A

Fig. 2: 4000A

1.875

B

C

1.875

C

B

D

Arc Voltage

This curve gives the peak
arc voltage, UL, which

may appear across the
fuse during its operation
as a function of the
applied working voltage,
Eg, (rms) at a power 

factor of 15%.

Power Losses

Watts loss at rated current
is given in the electrical
characteristics. The curve
allows the calculation of
the power losses at load
currents lower than the
rated current. The 
correction factor, Kp, is

given as a function of the
RMS load current, Ib, in %

of the rated current.

Catalog Numbers

Electrical Characteristics

I

2

t (A

2

Sec)

Catalog

Rated Current

Clearing

Watts

Numbers

RMS-Amps

Pre-arc

at 130V

Loss

FWA-1000AH

1000

170000

460000

60

FWA-1200AH

1200

270000

730000

70

FWA-1500AH

1500

520000

1400000

78

FWA-2000AH

2000

860000

2400000

108

FWA-2500AH

2500

1500000

4100000

130

FWA-3000AH

3000

2100000

5700000

150

FWA-4000AH

4000

3400000

9200000

257

• Watts loss provided at rated current.
• See accessories on page 141.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

North American — FWA 130V:  1000-4000A

FWA

Specifications
Description:

North American

style flush-end high speed fuses.

Dimensions:

See Dimensions

illustrations.

Ratings:

Volts: — 130Vac

Amps: — 1000-4000A

IR: — 200kA RMS Sym.

— 50kA @130Vdc

Agency Information:

CE, UL Recognized JFHR2.E91958

on 1000-2000A fuses

Electrical Characteristics

Total Clearing I

2

t

The total clearing I

2

t at

rated voltage and at power
factor of 15% are given in
the electrical 
characteristics. For other
voltages, the clearing I

2

t is

found by multiplying by
correction factor, K, given
as a function of applied
working voltage, Eg, (rms).

130

104

65

26

1.5

1.0

0.5

0.3

0.2

0.15

E

g

K

U

L

E

g

200

100

100

150

50

300

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

Data Sheet: 720001

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127

High Speed

Fuses

North American — FWA 130V:  1000-4000A

FWA 1000-4000A: 130V

Time-Current Curve

10

3

2

2

4

6

8

2

10

4

2

4

6

8

10

5

Prospective Current In Amps RMS

2

4

6

2

6
4

10

0

2

6
4

10

1

2

6
4

2

6
4

2

6
4

V

irtual Pr

e-Ar

cing Time In Seconds

6
4

2

6

2

4

10

–1

10

–2

10

–3

10

–4

10

2

10

3

10

4

FWA-4000AH

FWA-3000AH

FWA-2500AH

FWA-2000AH

FWA-1500AH

FWA-1200AH

FWA-1000AH

FWA-4000AH

FWA-3000AH

FWA-2500AH

FWA-2000AH

FWA-1500AH

FWA-1200AH

FWA-1000AH

Prospective Short-Circuit Current Symmetrical RMS

Peak Let-Thr

ough Curr

ent

2

6

4

2

6

4

2

2

4

6

2

4

6

2

4

6

10

4

10

5

10

3

10

4

10

5

10

3

Peak Let-Through Curve

Data Sheet: 35785301

High Speed Fuses

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128

High Speed Fuses

2.656

1.936

2.188

1.156

0.312

0.438

0.750

1.000

0.125

Dimensions - in

Fig. 1: 70-400A

1.500

0.250

3.500

2.438

1.250

1.000

0.406

Fig. 2: 500-1000A

1mm = 0.0394” / 1” = 25.4mm

North American — FWA 150V:  70-1000A

FWA

Specifications
Description:

North American style 

stud-mount  fuses.

Dimensions:

See Dimensions 

illustrations.

Ratings:

Volts: — 150Vac/dc*

Amps: — 70-1000A

IR: — 100kA Sym. (70-400A)

— 200kA Sym. (450-1000A)

— 20kA @150Vdc (70-800A)

— 100kA @ 80Vdc (70-1000A)

*1000A rated @ 80Vdc.

Agency Information:

CE, UL Recognized JFHR2.E91958

Electrical Characteristics

Total Clearing I

2

t

The total clearing I

2

t at rated

voltage and at power factor 
of 15% are given in the 
electrical characteristics. For
other voltages, the clearing 
I

2

t is found by multiplying by 

correction factor, K, given as
a function of applied working
voltage, Eg, (rms).

Arc Voltage

This curve gives the peak
arc voltage, UL, which may

appear across the fuse 
during its operation as a
function of the applied
working voltage, Eg, (rms)

at a power factor of 15%.

Power Losses

Watts loss at rated current
is given in the electrical
characteristics. The curve
allows the calculation of
the power losses at load
currents lower than the
rated current. The 
correction factor, Kp, is

given as a function of the
RMS load current, Ib, in %

of the rated current.

Catalog Numbers

Electrical Characteristics

Rated

I

2

t (A

2

Sec)

Catalog

Current

Clearing

Watts

Number

RMS-Amps

Pre-arc

at 150V

Loss

FWA-70B

70

470

4000

6.9

FWA-80B

80

670

6000

7.7

FWA-100B

100

1200

12000

9.0

FWA-125B

125

1870

18000

11.2

FWA-150B

150

2700

26000

13.5

FWA-200B

200

4780

45000

17.6

FWA-250B

250

7470

70000

22.5

FWA-300B

300

10760

100000

27.0

FWA-350B

350

15700

140000

30.6

FWA-400B

400

20300

180000

35.2

FWA-500A

500

39000

120000

35.0

FWA-600A

600

46000

140000

47.0

FWA-700A

700

75000

220000

49.0

FWA-800A

800

92000

280000

58.0

FWA-1000A

1000

170000

510000

60.0

• Watts loss provided at rated current.
• See accessories on page 141.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

150

102

70

22

1.5

1.0

0.5

0.3

0.2

0.15

Eg

K

1)

2)

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

U

L

E

g

200

100

100

150

50

300

1) 500-1000A Range
2) 70-400A Range

Data Sheet: 720002

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129

High Speed

Fuses

North American — FWA 150V:  70-1000A

Prospective Current In Amps RMS

V

irtual Pr

e-Ar

cing Time In Seconds

10

2

2

4

6

8

10

3

2

4

6

8

10

4

2

4

6

2

6
4

10

0

2

6
4

10

1

2

6
4

2

6
4

2

6
4

6
4

2

6

2

4

10

–1

10

–2

10

–3

10

–4

10

2

10

3

10

4

FWA-1000A

FWA-800A

FWA-700A

FWA-600A

FWA-500A

FWA-200A

FWA-400A

FWA-350A

FWA-300A

FWA-250A

FWA-150A

FWA-70A
FWA-80A
FWA-100A
FWA-125A

FWA 70-1000A: 150V

Time-Current Curve

Prospective Short-Circuit Current Symmetrical RMS

Peak Let-Thr

ough Curr

ent

2

6

4

2

6

4

2

6

4

2

4

6

2

4

6

2

4

6

10

2

10

3

10

4

10

6

10

2

10

3

10

4

10

5

2

FWA-400A

FWA-350A

FWA-300A

FWA-250A

FWA-200A

FWA-150A

FWA-100A

FWA-80A

FWA-70A

Peak Let-Through Curve

Data Sheet: 35785310

High Speed Fuses

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130

High Speed Fuses

North American — FWX 250V: 35-2500A

FWX

Specifications
Description:

North American

style stud-mount and flush-end
fuses.

Dimensions:

See Dimensions

illustrations.

Ratings:

Volts: — 250Vac/dc

Amps: — 35-2500A

IR: — 200kA RMS Sym.

50kA@250Vdc (35-800A)

Agency Information:

CE, UL Recognized JFHR2.E56412

& CSA Component Acceptance file Class 1422-30, (53787)
on 35-800A fuses (50kA IR @250Vdc).

Electrical
Characteristics

Total Clearing I

2

t

The total clearing I

2

t at rated

voltage and at power factor
of 15% are given in the
electrical characteristics.
For other voltages, the
clearing I

2

t is found by 

multiplying by correction
factor, K, given as a 
function of applied working
voltage, Eg, (rms).

Arc Voltage

This curve gives the peak
arc voltage, UL, which may

appear across the fuse 
during its operation as a
function of the applied 
working voltage, Eg, (rms)

at a power factor of 15%.

Power Losses

Watts loss at rated current is
given in the electrical char
acteristics. The curve allows 
the calculation of the power 
losses at load currents lower
than the rated current . The
correction factor, Kp , is 
given as a function of the 
RMS load current, Ib , in % 
of the rated current .

Catalog Numbers

Electrical Characteristics

Rated

I

2

t (A

2

Sec)

Catalog

Current

Clearing

Watts

Number

RMS-Amps

Pre-arc

at 250V

Loss

FWX-35A

35

50

230

4.2

FWX-40A

40

60

310

5.2

FWX-45A

45

80

390

5.7

FWX-50A

50

100

520

6.0

FWX-60A

60

140

740

8.1

FWX-70A

70

330

1400

7.2

FWX-80A

80

430

1850

8.1

FWX-90A

90

570

2450

9.0

FWX-100A

100

740

3150

10.0

FWX-125A

125

1130

4850

12.5

FWX-150A

150

1620

6950

15.7

FWX-175A

175

2170

9300

18.5

FWX-200A

200

2790

12000

22

FWX-225A

225

3210

14700

24

FWX-250A

250

3960

18100

27

FWX-275A

275

4720

21600

31

FWX-300A 300

6000

27300

32

FWX-350A

350

10600

48600

39

FWX-400A

400

14500

66100

44

FWX-450A

450

22100

101000

49

FWX-500A

500

28000

128000

54

FWX-600A

600

41100

188000

62

FWX-700A

700

48800

190000

72

FWX-800A

800

59000

230000

84

FWX-1000AH

1000

44000

360000

100

FWX-1200AH

1200

92000

750000

103

FWX-1500AH

1500

120000

880000

140

FWX-1600AH

1600

160000

1200000

140

FWX-2000AH

2000

320000

2300000

151

FWX-2500AH

2500

670000

4700000

163

• Watts loss provided at rated current.     • See accessories on page 141.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low

energy let-through (I

2

t)

• Superior cycling capability

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

1.5

1.0

0.5

0.3

0.2

0.15

75

125

300

200

250

E

g

K

1)

2)

U

L

1.4
1.2

10

3

800

600

500

400

300

200

50

100

150

200

250

E

g

1)

2)

1) 35-800A Range
2) 1000-2500A Range

1) 35-800A Range
2) 1000-2500A Range

A

E

D

C

F

J

G

B

H

A

B

C

A

B

C

D

Fig. 1:

35-800A

Fig. 2:

1000-1200A

Fig. 3:

1500-2500A

Dimensions - in

Tapped

Amp

Thread

Range

Fig. A

B

C

D

E

F

G

H

J

Depth

35-60

1

3.19 0.81 1.59 2.59 2.25 0.34 0.63 0.13 0.52 —

70-200

1

3.13 1.22 1.59 2.44 2.19 0.34 1.00 0.19 0.47 —

225-600

1

3.84 1.50 1.59 2.94 2.25 0.41 1.00 0.25 0.75 —

700-800

1

3.84 2.00 1.59 3.03 2.28 0.41 1.50 0.25 0.78 —

1000-1200

2

2.59 3.00 1.50 —

—

—

—

—

—

3

⁄

8

”-24 x 

1

⁄

2

”

1500-2500

3

2.59 3.50 1.50 1.50 —

—

—

—

—

3

⁄

8

”--24 x 

1

⁄

2

”

1mm = 0.0394” / 1” = 25.4mm

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

Data Sheet: 720005

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

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131

High Speed

Fuses

North American — FWX 250V: 35-2500A

10

4

10

3

10

2

10

2

10

3

10

4

10

1

10

0

10

–1

10

–2

10

–3

10

–4

2

Prospective Current In Amps RMS

V

irtual Pr

e-ar

cing Time In Seconds

FWX-800A

FWX-600A

FWX-500A

FXW-400A

FWX-350A

FWX-200A

FWX-150A

FWX-70A

FWX-60A

FWX-40A

FWX-35A

FWX-100A

10

3

2

2

4

6

8

2

10

4

2

4

6

8

10

5

2

4

6

2

6
4

10

0

2

6
4

2

6
4

2

6
4

2

6
4

6
4

2

6

2

4

10

–1

10

–2

10

–3

10

–4

10

2

10

1

10

3

10

4

FWX-2500AH

FWX-2000AH

FWX-1600AH

FWX-1500AH

FWX-1200AH

FWX-1000AH

Prospective Current In Amps RMS

V

irtual Pr

e-Ar

cing Time In Seconds

FWX 1000-2500A(H): 250V

Time-Current Curve

FWX 35-800A: 250V

Time-Current Curve

FWX-150A
FWX-100A
FWX-70A
FWX-60A
FWX-45A
FWX-35A

FWX-200A

FWX-300A

FWX-400A

FWX-600A

FWX-800A

10

2

10

3

10

4

10

5

10

2

10

3

10

4

10

5

Prospective Short-Circuit Current Symmetrical RMS

P

eak Let-Through Current

A

B

Prospective Short-Circuit Current Symmetrical RMS

Peak Let-Thr

ough Curr

ent

2

6

4

2

6

4

2

4

6

2

4

6

2

4

6

10

3

10

4

10

5

FWX-2000AH

FWX-1600AH

 FWX-1500AH

FWX-1200AH

 FWX-1000AH

10

3

10

4

10

5

FWX-2500AH

Peak Let-Through Curve

Peak Let-Through Curve

Data Sheet: 359

Data Sheet: 35785299

High Speed Fuses

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

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132

High Speed Fuses

North American — FWH 500V:  35-1600A

FWH

Specifications
Description:

North American style

stud-mount fuses.

Dimensions:

See Dimensions 

illustration.

Ratings:

Volts: — 500Vac/dc (35-800A only)

Amps: — 35-1600A

IR: — 200kA Sym.

— 50kA @ 500Vdc (35-800A)

Agency Information:

CE, UL Recognition JFHR2.E91958

FWH-_B (35-200A, 1000-1200A), JFHR2.E56412 
FWH-_A (225-600A), CSA Component Acceptance Class
1422-30, File 53787 (35-1600A).

Electrical Characteristics

Total Clearing I

2

t

The total clearing I

2

t at rated

voltage and at power factor of
15% are given in the electrical
characteristics. For other 
voltages, the clearing I

2

t is

found by multiplying by 
correction factor, K, given as a
function of applied working
voltage, Eg, (rms).

Arc Voltage

This curve gives the peak
arc voltage, UL, which

may appear across the
fuse during its operation
as a function of theapplied
working voltage, Eg, (rms)

at a power 
factor of 15%.

Power Losses

Watts loss at rated 
current is given in the
electrical characteristics.
The curve allows the 
calculation of the power
losses at load currents
lower than the rated 
current. The correction
factor, Kp, is given as a

function of the RMS load
current, Ib, in % of the
rated current.

Catalog Numbers

Electrical Characteristics

Rated

I

2

t (A

2

Sec)

Catalog

Current

Clearing

Watts

Numbers

RMS-Amps

Pre-arc

at 500V

Loss

FWH-35B

35

34

150

8

FWH-40B

40

76

320

7.5

FWH-45B

45

105

450

7.5

FWH-50B

50

135

670

7.5

FWH-60B

60

210

900

9.9

FWH-70B

70

210

900

10.6

FWH-80B

80

305

1400

12.7

FWH-90B

90

360

1600

15

FWH-100B

100

475

2000

17

FWH-125B

125

800

3500

25

FWH-150B

150

1100

4600

30

FWH-175B

175

1450

6200

35

FWH-200B

200

1900

8500

40

FWH-225A

225

4600

23300

39

FWH-250A

250

6300

32200

41

FWH-275A

275

7900

40300

46

FWH-300A

300

9800

49800

51

FWH-325A

325

13700

63800

53

FWH-350A

350

14500

72900

58

FWH-400A

400

19200

96700

65

FWH-450A

450

24700

127000

74

FWH-500A

500

29200

149000

84

FWH-600A

600

41300

206000

108

FWH-700A

700

55000

298000

120

FWH-800A

800

76200

409000

129

FWH-1000A

1000

92000

450000

145

FWH-1200A

1200

122000

600000

180

FWH-1400A

1400

200000

1000000

210

FWH-1600A

1600

290000

1400000

230

• Watts loss provided at rated current.     • See accessories on page 141.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low 

energy let-through (I

2

t)

• Superior cycling capability

500

400

250

100

1.5

1.0

0.5

0.3

0.2

0.15

E

g

K

1)

2)

U

L

2.0

1.6

1.2

10

3

800

600

500

400

300

100

400

300

200

500

E

g

1

2)

1)

1) 35-200 & 1000-1600A Range
2) 225-800A Range

A

E

D

C

F

J

G

B

H

10.219

3.219

0.625

4.25

0.75

3.5

6.219

0.125

0.5

1.625

1.750

8.969

Fig. 1: 35-1200A

Fig. 2: 1400-1600A

Dimensions - in

Amp
Range

Fig. A

B

C

D

E

F

G

H

J

35-60

1

3.188 0.813 1.593 2.541 2.193 0.344 0.719 0.125 0.518

70-100

1

3.625 0.947 1.736 2.853 2.807 0.352 0.750 0.125 0.375

125-200

1

3.625 1.156 1.836 2.892 2.768 0.344 1.000 0.188 0.406

225-400

1

4.340 1.500 2.090 3.440 2.750 0.410 1.000 0.250 0.750

450-600

1

4.340 2.000 2.090 3.530 2.780 0.410 1.500 0.250 0.780

700-800

1

6.340 2.500 2.090 4.970 3.440 0.530 2.000 0.380 1.300

1000-1200

1

6.969 3.000 3.219 5.465 4.475 0.625 2.375 0.438 1.120

1400-1600

2

See Drawing

1mm = 0.0394” / 1” = 25.4mm

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

1) 35-800A Range
2) 1000-1600A Range

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

Data Sheet: 720007

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

For product data sheets, visit www.cooperbussmann.com/DatasheetsEle

133

High Speed

Fuses

North American — FWH 500V:  35-1600A

2

4

6

8

10

2

2

2

4

6

8

2

10

3

2

4

6

8

10

4

2

4

6

2

6
4

2

6
4

2

6
4

2

6
4

2

6
4

6
4

2

6

2

4

10

0

10

1

10

–1

10

–2

10

–3

10

–4

10

2

10

3

10

4

FWH-90B

FWH-80B

FWH-125B

FWH-100B

FWH-175B
FWH-200B

FWH-150B

FWH-60B
FWH-70B

FWH-50B

FWH-45B

FWH-40B

FWH-35B

FWH-1200A
FWH-1400A

FWH-900A
FWH-1000A

FWH-1600A

Prospective Current In Amps RMS

10

–3

10

–2

10

–1

10

0

10

1

10

2

10

3

10

–4

FWH-300A

FWH-400A

FWH-500A

FWH-600A

FWH-800A

Prospective Current In Amps RMS

V

irtual Pre-Arcing 

T

ime In Seconds

10

2

10

3

10

4

10

5

FWH 250-800A: 500V

Time-Current Curve

FWH 35-200A(B) & 900-1600A(A): 500V

Time-Current Curve

FWH-200B

FWH-150B

FWH-125B

FWH-100B

FWH-80B

FWH-60B

FWH-50B

FWH-35B

FWH-40B

FWH-1000A

FWH-1200A

FWH-1400A

FWH-1600A

Prospective Short-Circuit Current Symmetrical RMS

Peak Let-Thr

ough Curr

ent

2

4

2

6

6

4

2

6

4

2

4

6

2

4

6

2

4

6

2

10

2

10

3

10

4

10

5

10

2

10

3

10

4

10

5

FWH-800A
FWH-600A
FWH-500A
FWH-400A
FWH-300A
FWH-250A

10

2

10

5

10

4

10

3

10

3

10

4

10

5

10

2

Prospective Short-Circuit Current Symmetrical RMS

Peak Let-Thr

ough Curr

ent

A

B

Peak Let-Through Curve

Peak Let-Through Curve

Data Sheet: 35785304

Data Sheet: 360

High Speed Fuses

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134

High Speed Fuses

North American — KAC 600V:  1-1000A

F

G

A

C

B1

H

D

Fig. 1: 1-30 & 450-1000A

A

B3

B2

C

E

D

F

H

G

Fig. 2: 35-400A

Dimensions - in

KAC

Specifications
Description:

North American style 

stud-mount fuses. These 600V fuses are 
supplied as replacements only. For new
installations, Bussmann recommends the
700V FWP Series fuse.

Dimensions:

See Dimensions illustrations.

Ratings:

Volts: — 600Vac

Amps: — 1-1000A

IR: — 200kA RMS Sym.

Agency Information:

CE, UL Recognition

JFHR2.E56413 on 1-600A only.

Catalog Numbers (Amps)

KAC-1

KAC-25

KAC-175

KAC-2

KAC-30

KAC-200

KAC-3

KAC-35

KAC-225

KAC-4

KAC-40

KAC-250

KAC-5

KAC-45

KAC-300

KAC-6

KAC-50

KAC-350

KAC-7

KAC-60

KAC-400

KAC-8

KAC-70

KAC-450

KAC-9

KAC-80

KAC-500

KAC-10

KAC-90

KAC-600

KAC-12

KAC-100

KAC-700

KAC-15

KAC-110

KAC-800

KAC-17.5

KAC-125

KAC-1000

KAC-20

KAC-150

• See accessories on page 141.

Features and Benefits

• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• Power converters/rectifiers
• Reduced voltage starters

Data Sheet: 720009

Amp
Range

Fig.

A

B1

B2

B3

C

D

E

F

G

H

1-30A

1

2.875

2.500

–

–

1.875

0.406

–

0.563

0.063

0.257

35-60A

2

4.375

–

3.750

3.500

2.750

0.625

0.343

0.813

0.094

0.468

70-100A

2

5.000

–

4.063

3.656

2.750

0.750

0.406

1.000

0.125

0.609

110-200A

2

5.140

–

4.390

3.766

2.906

1.000

0.406

1.500

0.188

0.718

225-400A

2

6.182

–

4.815

4.565

3.000

1.625

0.562

2.000

0.250

0.687

450-800A

1

6.250

4.750

–

–

3.063

2.000

–

2.500

0.250

0.563

1000A

1

7.250

4.750

–

–

3.063

2.750

–

3.500

0.375

0.563

1mm = 0.0394˝ / 1˝ = 25.4mm

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

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135

High Speed

Fuses

North American — KBC 600V:  35-800A

Dimensions - in

Amp
Range

Fig. A

B

C

D

E

F

G

H

I

35-60A

1

4.375

3.750

3.500 2.750 0.343 0.625 0.813 0.094 0.468

70-100A

2

See Drawing

110-200A

1

4.406

3.719

3.594 2.906 0.312 0.875 1.219 0.187 0.375

225-400A

1

5.125

4.188

3.563 2.906 0.406 1.000 1.500 0.250 0.719

450-600A

1

5.125

4.389

3.687 2.875 0.406 1.500 2.000 0.250 0.757

800A

3

See Drawing

1mm = 0.0394” / 1” = 25.4mm

KBC

Specifications
Description:

North American

style stud-mount and flush-end
fuses. These 600V fuses are 
supplied as replacements only. 
For new installations, Bussmann
recommends the  700V FWP
Series fuse.

Dimensions:

See Dimensions

illustrations.

Ratings:

Volts: — 600Vac

Amps: — 35-800A

IR: — 200kA RMS Sym.

Agency Information:

CE, UL Recognition JFHR2.E56412

on 35-600A only.

A

C

B

D

E

F

G

I

H

Fig. 1: 35-60 and 110-600A

Fig. 2: 70-100A

4.000

3.750

2.859

2.500

0.750

0.750

‹

/

•" - 24 ≈ ⁄

/

™"

Fig. 3: 800A

0.750

3.656

4.406

2.906

0.312

1.000

0.125

Catalog Numbers (Amps)

KBC-35

KBC-100

KBC-300

KBC-40

KBC-110

KBC-350

KBC-45

KBC-125

KBC-400

KBC-50

KBC-150

KBC-450

KBC-60

KBC-175

KBC-500

KBC-70

KBC-200

KBC-600

KBC-80

KBC-225

KBC-800

KBC-90

KBC-250

• See accessories on page 141.

Features and Benefits

• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• Power converters/rectifiers
• Reduced voltage starters

Data Sheet: 720010

High Speed Fuses

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

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136

High Speed Fuses

North American — FWP 700V:  5-1200A

FWP

Specifications
Description:

North American

style stud-mount fuses.

Dimensions:

See Dimensions

illustrations.

Ratings:

Volts: — 700Vac/dc

Amps: — 5-1200A

IR: — 200kA RMS Sym.

— 50kA @700Vdc

Agency Information:

CE, UL Recognition JFHR2.E91958

FWP-_B (5-100A, 700-1200A), JFHR2.E56412 FWP-_A
(125-600A) & CSA Component Acceptance file Class 
1422-30, (53787) on 5-800A

Electrical Characteristics

Total Clearing I

2

t

The total clearing I

2

t at rated

voltage and at power factor of
15% are given in the electrical
characteristics. For other 
voltages, the clearing I

2

t is

found by multiplying by 
correction factor, K, given as 
a function of applied working
voltage, Eg, (rms).

Arc Voltage

This curve gives the peak arc
voltage, UL, which may

appear across the fuse 
during its operation as a
function of the applied 
working voltage, Eg, (rms) at

a power factor of 15%.

Power Losses

Watts loss at rated current is
given in the electrical 
characteristics. The curve
allows the calculation of the
power losses at load 
currents lower than the rated
current. The correction factor,
Kp, is given as a function of

the RMS load current, Ib, in

% of the rated current.

Catalog Numbers

Electrical Characteristics

Rated

I

2

t (A

2

Sec)

Catalog

Current

Clearing

Watts

Numbers

RMS-Amps

Pre-arc

at 700V

Loss

FWP-5B

5

1.6

10

1.5

FWP-10B

10

3.6

20

4

FWP-15B

15

10

75

5.5

FWP-20B

20

26

180

6

FWP-25B

25

44

340

7

FWP-30B

30

58

450

9

FWP-35B

35

34

160

12

FWP-40B

40

76

320

12

FWP-50B

50

135

600

12

FWP-60B

60

210

950

15.5

FWP-70B

70

305

2000

18

FWP-80B

80

360

2400

21

FWP-90B

90

415

2700

25

FWP-100B

100

540

3500

27

FWP-125A

125

1800

7300

28

FWP-150A

150

2900

11700

32

FWP-175A

175

4200

16700

35

FWP-200A

200

5500

22000

43

FWP-225A

225

7700

31300

45

FWP-250A

250

10500

42500

48

FWP-300A

300

17600

71200

58

FWP-350A

350

23700

95600

65

FWP-400A

400

31000

125000

78

FWP-450A

450

36400

137000

94

FWP-500A

500

45200

170000

107

FWP-600A

600

66700

250000

122

FWP-700A

700

54000

300000

125

FWP-800A

800

78000

450000

140

FWP-900A

900

91500

530000

150

FWP-1000A

1000

120000

600000

170

FWP-1200A

1200

195000

1100000

190

• Watts loss provided at rated current.  • See accessories on page 141.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low

energy let-through (I

2

t)

• Superior cycling capability

700

604

460

316

1.5

1.0

0.5

0.3

0.2

0.15

E

g

K

1)

3)

2)

U

L

2

1.6
1.4
1.2
10

3

8

6
5

4

3

400

300

500

600

700

E

g

1)

2)

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

1) 125-600A Range
2) 35-100 & 700-1200A Range

1) 35-100A Range
2) 125-600A Range
3) 700-1200A Range

A

E

D

C

F

J

G

B

H

Fig. 1: 5-800A

Dimensions - in

Amp
Range

Fig.

A

B

C

D

E

F

G

H

I

5-30

1

2.870 0.563 1.855 2.477 2.477 0.250 0.405 0.063 0.250

35-60

1

4.375 0.813 2.750 3.708 3.312 0.344 0.725 0.125 0.542

70-100

1

4.406 0.947 2.594 3.625 3.563 0.344 0.750 0.125 0.375

125-200

1

5.090 1.500 2.840 4.190 3.500 0.410 1.000 0.250 0.750

225-400

1

5.090 2.000 2.840 4.280 3.530 0.410 1.500 0.250 0.780

450-600

1

7.090 2.500 2.840 5.720 4.190 0.530 2.000 0.380 1.300

700-800

1

6.630 2.000 2.844 5.562 5.062 0.625 1.500 0.250 0.875

900-1000 2

See Drawing

1200

3

See Drawing

1mm = 0.0394” / 1” = 25.4mm

7.594

0.5

3.500

3.844

1.031

0.625

2.750

5.966

5.154

1.375

Fig. 2: 900-1000A

Fig. 3: 1200A

10.844

3.844 

0.625

4.250

0.750

3.500

6.840

0.125

0.500

1.625
1.750

9.590

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

Data Sheet: 720012

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137

High Speed

Fuses

North American — FWP 700V:  5-1200A

2

4

6

8

10

2

2

2

4

6

8

2

10

3

2

4

6

8

10

4

2

4

6

2

6
4

2

6
4

10

1

10

0

2

6
4

2

6
4

2

6
4

6
4

2

6

2

4

10

–1

10

–2

10

–3

10

–4

10

2

10

3

10

4

FWP-35B

FWP-80B
FWP-90B
FWP-100B

FWP-60B
FWP-70B

FWP-40B
FWP-50B

FWP-900A

FWP-1200A

FWP-1000A

FWP-800A

FWP-700A

Prospective Current In Amps RMS

V

irtual Pr

e-Ar

cing Time In Seconds

FWP 35-100A(B) & 700-1200A(A): 700V

Time-Current Curve

Prospective Short-Circuit Current

Peak Let-Thr

ough Curr

ent

2

6

4

2

6

4

2

6

4

2

4

6

2

4

6

2

4

6

10

2

10

3

10

4

10

6

10

2

10

3

10

4

10

5

2

FWP-700A

FWP-800A

FWP-1000A

FWP-100B

FWP-35B

FWP-70B

FWP-40B

FWP-50B

FWP-60B

FWP-1200A

Peak Let-Through Curve

2

4

6

8

10

1

2

2

4

6

8

2

10

2

2

4

6

8

10

3

2

4

6

2

6
4

2

6
4

2

6
4

2

6
4

2

6
4

6
4

2

6

2

4

10

–1

10

–2

10

–3

10

–4

10

2

10

1

10

0

10

3

10

4

Prospective Current In Amps RMS

V

irtual Pr

e-Ar

cing Time In Seconds

FWP-10B
FWP-15B
FWP-20B

FWP-5B

FWP-30B

FWP-25B

FWP 5-30A(B): 700V

Time-Current Curve

Prospective Short-Circuit Current

Peak Let-Thr

ough Curr

ent

2

4

2

6

6

4

2

6

4

2

4

6

2

4

6

2

4

6

2

4

6

10

1

10

2

10

3

10

4

10

1

10

2

10

3

10

4

10

5

FWP- 5B

FWP-10B

FWP-15B

FWP-20B

FWP-25B

FWP-30B

2

Peak Let-Through Curve

Data Sheet: 35785308

Data Sheet: 35785316

High Speed Fuses

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138

High Speed Fuses

North American — FWP 700V:  5-1200A

10

–4

10

–3

10

–2

10

–1

10

0

10

1

10

2

10

3

FWP-150A

FWP-200A

FWP-300A

FWP-400A

FWP-600A

Prospective Current In Amperes RMS

V

irtual Pre-Arcing 

T

ime In Seconds

10

2

10

3

10

4

10

5

Prospective Current In Amps RMS

FWP 150-600A: 700V

Time-Current Curve

FWP-600A
FWP-400A
FWP-300A
FWP-200A
FWP-150A

10

2

10

3

10

4

10

5

10

2

10

3

10

4

10

5

Prospective Short-Circuit Current Symmetrical RMS

Peak Let-Through Current

A

B

Peak Let-Through Curve

Data Sheet: 361

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139

High Speed

Fuses

North American — FWJ 1000V:  35-2000A

FWJ

Specifications
Description:

North American

style stud-mount fuses.

Dimensions:

See Dimensions

illustration.

Ratings:

Volts: — 1000Vac/800Vdc

Amps: — 35-2000A

IR: — 25kA (35-200A)

— 100kA (250-2000A)

— 50kA @ 800Vdc 

(35-200A, 450-600A)

Agency Information:

CE, UL

Recognition JFHR8.E91958 on 
35-600A only. 

Electrical Characteristics

Total Clearing I

2

t

The total clearing I

2

t at rated

voltage and at power factor of
15% are given in the electrical
characteristics. For other 
voltages, the clearing I

2

t is

found by multiplying by 
correction factor, K, given as
a function of applied working
voltage, Eg, (rms).

Arc Voltage

This curve gives the peak arc
voltage, UL, which may

appear across the fuse 
during its operation as a
function of the applied 
working voltage, Eg, (rms) 

at a power factor of 15%.

Power Losses

Watts loss at rated current is
given in the electrical 
characteristics. The curve
allows the calculation of the
power losses at load 
currents lower than the
rated current. The 
correction factor, Kp, is

given as a function of the
RMS load current, Ib, in %

of the rated current.

Catalog Numbers

Electrical Characteristics

Rated

I2t (A2 Sec)

Catalog

Current

Clearing

Watts

Numbers

RMS-Amps

Pre-arc

at 1000V

Loss

FWJ-35A

35

210

2000

7

FWJ-40A

40

300

2500

8

FWJ-50A

50

470

3500

10

FWJ-60A

60

670

5000

11

FWJ-70A

70

1100

6900

12

FWJ-80A

80

1550

9700

13

FWJ-90A

90

1900

12000

14

FWJ-100A

100

2800

17500

15

FWJ-125A

125

4800

35000

16

FWJ-150A

150

6300

45000

25

FWJ-175A

175

7500

65000

30

FWJ-200A

200

11700

80000

32

FWJ-250A

250

16000

112000

50

FWJ-300A

300

23500

164000

56

FWJ-350A

350

33000

231000

62

FWJ-400A

400

47000

330000

67

FWJ-500A

500

39500

329000

95

FWJ-600A

600

61000

520000

105

FWJ-800A

800

87000

500000

182

FWJ-1000A

1000

190000

1100000

206

FWJ-1200A

1200

370000

2100000

240

FWJ-1400A

1400

470000

2700000

248

FWJ-1600A

1600

700000

4000000

267

FWJ-1800A

1800

925000

5300000

239

FWJ-2000A

2000

1330000

7600000

244

• Watts loss provided at rated current.
• See accessories on page 141.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

2000

1600

1200

800

400

200

600

1000 1400 1800

U

L

E

g

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

1000

800

500

200

1.5

1.0

0.5

0.3

0.2

0.15

Eg

K

A

E

D

C

F

J

G

B

H

Fig. 1: 35-2000A

Dimensions - in

Amp
Range

Fig.

A

B

C

D

E

F

G

H

I

35-60

1

5.000 0.940 3.110 4.235 4.180 0.352 0.750 0.125 0.380

70-100

1

4.932 1.125 3.085 4.266 4.156 0.352 1.000 0.188 0.407

125-200 1

5.685 1.526 3.261 4.803 4.055 0.445 1.000 0.250 0.819

250-400 1

5.768 2.000 3.500 4.811 4.150 0.433 1.500 0.250 0.764

500-600 1

7.201 2.500 3.465 5.984 4.706 0.562 2.000 0.375 1.201

800-2000 1

6.811 3.500 3.312 5.472 4.962 0.625 2.750 0.500 0.880

1mm = 0.0394” / 1” = 25.4mm

Data Sheet: 720027

High Speed Fuses

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140

High Speed Fuses

North American — FWJ 1000V:  35-2000A

2

4

6

8

10

3

2

2

4

6

8

2

10

4

2

4

6

8

10

5

2

4

6

2

6
4

10

0

2

6
4

10

1

2

6
4

2

6
4

2

6
4

6
4

2

6

2

4

10

–1

10

–2

10

–3

10

–4

10

2

10

3

10

4

FWJ-1800A
FWJ-2000A

FWJ-800A
FWJ-1000A
FWJ-1200A
FWJ-1400A
FWJ-1600A

Prospective Current In Amperes RMS

V

irtual Pre-Arcing 

T

ime In Seconds

Prospective Current in Amps

FWJ 800-2000A: 1000V

Time-Current Curve

Prospective Current In Amps RMS

V

irtual Pr

e-Ar

cing Time In Seconds

10

2

2

2

4

6

8

2

10

3

2

4

6

8

10

4

2

4

6

2

6
4

10

0

2

6
4

2

6
4

2

6
4

2

6
4

6
4

2

6

2

4

10

–1

10

–2

10

–3

10

–4

10

2

10

3

10

4

FWJ-125A
FWJ-150A

FWJ-60A

FWJ-100A

FWJ-90A

FWJ-80A

FWJ-70A

FWJ-50A

FWJ-40A

FWJ-600A

FWJ-200A

FWJ-250A

FWJ-300A

FWJ-350A

FWJ-400A

FWJ-500A

FWJ-175A

10

1

FWJ 35-600A: 1000V

Time-Current Curve

Prospective Short-Circuit Current Symmetrical RMS

Peak Let-Thr

ough Curr

ent

2

4

2

6

6

4

2

6

4

2

2

4

6

2

4

6

2

4

6

2

4

6

10

2

10

3

10

4

10

5

10

2

10

3

10

4

10

5

FWJ-40A

FWJ-50A

FWJ-60A

FWJ-70A

FWJ-80A

FWJ-90A

FWJ-100A

FWJ-125A

FWJ-150A

FWJ-175A

FWJ-200A

FWJ-500A

FWJ-350A

FWJ-300A

FWJ-250A

FWJ-600A
FWJ-800A

FWJ-2000A
FWJ-1800A
FWJ-1600A
FWJ-1400A
FWJ-1250A
FWJ-1000A

FWJ-400A

Peak Let-Through Curve

Data Sheet: 35785303

Data Sheet: 35785309

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141

High Speed

Fuses

North American Fuse Accessories

Stud Type

C5268 Series

BS Style

Connector Type

Fixed Center

Fuse Bases (Blocks)

Modular Style

Bussmann offers a comprehensive line of fuse bases that
provide the user with design and manufacturing flexibility.
Two identical half bases make up a Bussmann modular fuse
base. These “split” units can be panel mounted any distance
apart to accommodate any length fuse.

Stud Type (Not sold in pairs)

The simpler design is the C5268 Series modular fuse base.
With this design, the fuse terminal and cable (with 
termination) are mounted on the same stud, minimizing labor
needed for installation. The stud type base is available in the
configuration shown in the table below.

Catalog

Max Fuse

Stud

Stud Dia.

Number

Amp Rating

Height (in)

& Threads

C5268-1

200

1.00

5

⁄

16

˝-18

C5268-2

200

1.75

5

⁄

16

˝-18

C5268-3

200

0.75

5

⁄

16

˝-18

C5268-4

100

1.00

1

⁄

4

˝-20

C5268-5

100

1.75

1

⁄

4

˝-20

Connector Type

Bussmann also offers a modular style fuse base that utilizes
a tin-plated connector (for wire termination and heat 
dissipation) and a plated-steel stud (for fuse mounting). The 
connector type fuse base is available in the configurations
shown below. Consult Bussmann for additional product
details.

Modular

Max

Max Fuse

Data Sheet

Base Style

Voltage

Amp Rating

Number

1BS101

600

100

1206

1BS102

600

400

1207

1BS103

600

400

1208

1BS104

600

600

1209

BH-0xxx

700

100

1200

BH-1xxx

2500

400

1201

BH-2xxx

5000

400

1202

BH-3xxx

1250

700

1203

Fixed Center Base Style

Bussmann offers a comprehensive line of fixed mount style
fuse bases under the trademark TRON

™

rectifier fuse blocks.

The cable and fuse connections are similar to the stud type
fuse base — both are mounted on the same stud. Consult
Bussmann for complete product details.

Refer to page 306 for BH style holders.

High Speed Fuses

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High Speed Fuses

142

Square Body Fuses

General Information

Designed and tested to:

•  IEC 60269: Part 4
•  UL Recognized

Bussmann offers a complete range of square body style
fuses and accessories. Their unique design and 
construction provide:

•  Minimal energy let-through (I

2

t)

•  Low operating temperature
•  Low watts loss

Square body style fuses are a very attractive solution for high
power applications which require a compact design with
superior performance. The construction and design of square
body style fuses make it easy for Bussmann to manufacture
custom products. Our cataloged offering provides only a 
sample of the wide variety of product which 
is available.

Each square body style fuse is available with a number of 
different end fittings. Options include:

•  DIN 43 653
•  DIN 43 620
•  Flush End (Metric/US)
•  French Style
•  US Style

Voltage Rating

All Bussmann square body style fuses are tested to IEC
60269: Part 4. This standard requires a test voltage which is
5% higher than the rated voltage. In North America, fuses are
required to clear only their rated voltage.

Accessories

Square Body style fuses are available with three different
open fuse indicator systems. Options include visual 
indication and indication utilizing a microswitch. Fuse 
blocks are also available for most applications.

Introduction

Square Body Contents

Page

Application Information

143-144

Accessories

Page

Indicator System

212

Fuse Bases

213

Square Body Fuse Ranges

Amps

Volts

AC

DC

10-7500

690

X

—

50-1400

1250

X

—

Volts

(IEC/UL)

Size

Class

Fuse Style

Page

aR

DIN 43 653

145-147

000,00

aR

Flush End Contact

145-147

aR

DIN 43 620

148-149

aR

DIN 43 653

150-151

aR

Flush End Contact

152-153

690/700

1*, 1, 2, 3

aR

US Style

154-155

aR

French Style

156-157

aR

Fuse Curves

158-159

1*, 2, 3

aR

DIN 43 620

160-162

4

aR

Flush End Contact

163-164

23, 24

aR

Flush End Contact

165-166

00, 1, 2, 3

aR

DIN 43 620

168-171

00

aR

DIN 43 653

172-173

aR

DIN 43 653

174-175

1*, 1, 2, 3

aR

Flush End Contact

176-177

1000

aR

US Style

178-179

aR

Fuse Curves

180-181

4

aR

Flush End Contact

182-184

24

aR

Flush End Contact

185-186

aR

DIN 43 653

187-188

1*, 1, 2, 3

aR

Flush End Contact

189-190

aR

US Style

191-192

1250/1300

aR

Fuse Curves

193-194

4

aR

Flush End Contact

195-197

23

aR

Flush End Contact

198-199

1000-2000

5

aR

Flush End Contact

200

DC Fuses

201-211

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143

Square Body Applications

Maximum Permissible Load Current

The rated current value of Bussmann fuses is based on the
ambient temperature in the space immediately below the fuse
of 20°C. The following graph gives correction factors (k) for a
range of temperatures (–40°C to +80°C). Maximum 
permissible continuous load currents can be calculated by
applying the following formula:

Ib

≤

In

≈

 k 

≈

 (1 + 0.05 V) x Kb

where

Ib = Maximum permissible continuous load current
In = Rated current of fuse
k

= Temperature correction factor

v

= Velocity of cooling air in m/s (max. 5 m/s).

Kb = Fuse load constant 1.0 

Temperature Correction Curve

The maximum permissible continuous load current Ib of a
fuse can be checked empirically (i.e., by satisfying the 
formula below) by making simple voltage and temperature
measurements under actual operating conditions after the
fuse has been installed in its operating location and loaded 
at the calculated Ib value:

E

2

≈

 (0.92 + 0.004t) 

≤

 N

E

1

where

E

1

= Voltage drop across fuse after 5 seconds

E

2

= Voltage drop across fuse after 2 hours

t

= Air temperature at start of test (°C)

N = Constant 

Fuse Rated Voltage (IEC) N

690

1.5

1250

1.6

 

Body Cross Section 

Standard fuse program includes barrels with different cross sections. 

Size 

000 00 1

1 

2 

3 

4 

Maximum 

Cross-section 

(mm) 

21 ≈ 36 

30 ≈ 47 

45 ≈ 45 

53 ≈ 53 

61 ≈ 61 

76 ≈ 76 

105 ≈ 105 

 

1 . 4

1 . 2

1

0 . 8

0 . 6

k

–

4 0

–

2 0

0

4 0

2 0

6 0

8 0

C

For product data sheets, visit www.cooperbussmann.com/DatasheetsEle

High Speed

Fuses

High Speed Fuses

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High Speed Fuses

144

Square Body Applications

Example Application of Square Body High Speed

Fuses Subject to Overload and Impulse Loading

Select a short-blade indicating fuse with indicator/adapter to
permit the use of a single-pole microswitch for remote 
indication and determine if the fuse selected will meet the 
following application parameters.

Application Parameters

Load Currents Expected

Load Type

Duration

Frequency of Occurrence

Amps

(

1) Normal

Continuous

—

300A

(2) Overload

60 Seconds

Once Per Hour

500A

(3a)

10 Seconds

2-3 Times Per Week

(3b)

Overload

20 Seconds (max.) Once Per Month

700A

(4) Impulse

0.5 Seconds

Less Than Once Per Month

1100A

Voltage Data

(5) Voltage Applied to Fuse During Fault Conditions

400V

(+10%)

Temperature Data

(6) Temperature Inside Cubicle in Which Fuse is Located (Natural Convection Cooling Only)
60°C

Thyrister Data

(7) Thyrister Peak Voltage Withstand

1000V

(8) Thyrister I

2

t Withstand at 10 Milliseconds*

90,000A

2

s

*Note: The I

2

t withstand of the thyrister may be given for other impulse durations (i.e., 1.5 ms,

3.5 ms, or 8.3 ms); however, the stated fuse I

2

t is valid for all impulse durations of 10 ms or

less.

Application Procedure

Step

Procedure

Remarks

(1)  Select a short-blade fuse to permit

1.1 Taking into consideration only the

mounting of microswitch 170H0069

continuous load current and ambient

temperature, from Table on page 127 

—

tentatively select fuse 170M3669

400A, 690V).

(2) Determine I

2

t (total clearing) at 440V.

2.1 See Table, page 127. Note I

2

t is

105,000A

2

s at rated voltage of 690V.

2.2 From the figure on page 126, note that

OK

correction factor K = 0.65.

2.3 I

2

t660V

≈

K = I

2

t440V

105,000 

≈

0.65 = 68,250

(3) Determine maximum arc voltage

3.1 From the figure on page 126, note that

at 440V

maximum voltage at 440V is 900V

OK

(4) Determine maximum permissible

4.1 Per page 115 data,

continuous load current Ib.

Ib = In ≈ k ≈ (1 + 0.05V) ≈ Kb

—

Ib = 400A ≈ 0.8 ≈ (1 + 0) ≈ 1

Ib = 320A

(5) Plot a “line profile” showing the

5.0 Calculate Imax per Table, 

expected load and overload currents.

High Speed Fuse Application Guide

—

Determine that overload and impulse

page 16, for each overload and impulse

load currents do not exceed their

load.

maximum permissible values.

(Item 2)

5.1 

Imax < 60% ≈ It

500A < 60% 

≈

950A

OK

500A < 570A

(Item 3a)

5.2 Imax < 60% ≈ It

700A < 60% ≈ 1360A

OK

700A < 780A

(Item 3b)

5.3 Imax < 70% ≈ It

700A < 70% ≈ 1150A

OK

700A < 805A

(Item 4)

5.4 Imax < 70% ≈ It

1100A < 70% ≈ 1800A

OK

1100A < 1260A

The tentatively selected fuse 170M3669 with microswitch 170H0069 meets all application parameters; no further
selection would be necessary.

10

2

10

3

10

–2

10

–1

10

0

10

1

10

2

10

3

Current In Amperes

T

ime In Seconds

A

A

170M3669  (400A)

Profile Line

Calculation of Watt Loss

From the Table on page 127, watt loss at 400 amps is 60
watts. The continuous load current of 300A is 75% of rated
current (400A). From page 126, the correction factor 
Kp = 0.5.

Watt Loss 75% = Watt Loss 100% 

≈ 

Kp

= 60W 

≈

0.5

= 30 watts

Special Fuses

Other high speed fuses are available from Bussmann with
voltage ratings of 380 to 10,000V and current ratings up to
10,000A in a single unit configuration. Fuses can be 
supplied with open fuse, “pin” indicators. Various types of
microswitches are also available (see page 212).

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145

Square Body DIN 43 653 — 690V/700V (IEC/UL):  10-400A

working voltage, Eg,

(rms).

Arc Voltage

This curve gives the
peak arc voltage, UL,

which may appear
across the fuse during
its operation as a 
function of the applied
working voltage, Eg,

(rms) at a power factor of 15%.

Power Losses

Watts loss at rated 
current is given in the
electrical characteristics.
The curve allows the
calculation of the power
losses at load currents
lower than the rated 
current. The correction
factor, Kp, is given as a

function of the RMS load current, Ib, in % of the rated 

current.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers

*

690V/700V (IEC/UL)  10-400A

Specifications
Description:

Square body DIN

43-653 stud mount high speed
fuses.

Dimensions:

See dimensions 

illustration.

Ratings:

Volts: — 690Vac (IEC)

— 700Vac (UL)

Amps: — 10-400A

IR: — 200kA RMS Sym.

Agency Information:

CE,

Designed and tested to  IEC
60269: Part 4. UL Recognized
E125085.JFHR2, CSA Certified:
Class 53787, File 1422-30 on
Size 000.

Electrical 
Characteristics

Total Clearing I

2

t

The total clearing I

2

t at

rated voltage and at power
factor of 15% are given 
in the electrical 
characteristics. For other
voltages, the clearing I

2

t is

found by multiplying by
correction factor, K, given
as a function of applied

100 200 300 400 500 600

K

1.5

1.0

0.5

0.4

0.3

0.2

E

g

690

U

L

1.4

1.2

10

3

6

8
7

9

5

4

3

E

g

200

300

400

500

600 690

K

p

30 40 50

60

70

80 90 100%

I

b

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

F

100

78

D

E

G

H

K

54

Indicator

Dimensions - mm

Type -U/80, -/80, -TN/80

Size

D

E

F

G

H

K

000

40

21

20

51

8

2

00

51

30

28

67

10

2

1mm = 0.0394” / 1” = 25.4mm

* Indication for Size 00 fuses is a red pin.

54 Max

64

30

48

62

M8

6

Indicator

Dimensions (mm)

Type 00B/60, 00BTN/60

1mm = 0.0394” / 1” = 25.4mm

For Other Voltage Ratings in This Body Style  

• See page 172 (1000V)

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Fuses

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High Speed Fuses

146

Square Body DIN 43 653 — 690V/700V (IEC/UL):  10-400A

Catalog Numbers

Catalog Numbers

-TN/80

00BTN/60                           

Electrical Characteristics

-U/80

-/80

Type T

00B/60

Type T

Rated

I

2

t (A

2

Sec)

Without

Visual

Indicator

Visual

Indicator

Current

Clearing

Watts

Indicator

Indicator

for Micro

Indicator

for Micro

Size

RMS-Amps

Pre-arc

at 660V

Loss

170M1308

170M1358

170M1408

10

3.8

25.5

3.0

170M1309

170M1359

170M1409

16

7.2

48

5.5

170M1310

170M1360

170M1410

20

11.5

78

7

170M1311

170M1361

170M1411

25

19

130

9

170M1312

170M1362

170M1412

32

40

270

10

170M1313

170M1363

170M1413

40

69

460

12

170M1314

170M1364

170M1414

50

115

770

15

170M1315

170M1365

170M1415

000

63

215

1450

16

170M1316

170M1366

170M1416

80

380

2550

19

170M1317

170M1367

170M1417

100

695

4650

24

170M1318

170M1368

170M1418

125

1200

8500

28

170M1319

170M1369

170M1419

160

2300

16000

32

170M1320

170M1370

170M1420

200

4200

28000

37

170M1321

170M1371

170M1421

250

7750

51500

42

170M1322

170M1372

170M1422

315

12000

80500

52

170M2608

170M2658

170M2708

170M2758

25

19

130

6

170M2609

170M2659

170M2709

170M2759

32

28.5

195

7

170M2610

170M2660

170M2710

170M2760

40

50

360

9

170M2611

170M2661

170M2711

170M2761

50

95

640

10

170M2612

170M2662

170M2712

170M2762

63

170

1200

12

170M2613

170M2663

170M2713

170M2763

80

310

2100

15

170M2614

170M2664

170M2714

170M2764

00

100

620

4150

20

170M2615

170M2665

170M2715

170M2765

125

1000

6950

25

170M2616

170M2666

170M2716

170M2766

160

1900

13000

30

170M2617

170M2667

170M2717

170M2767

200

3400

23000

35

170M2618

170M2668

170M2718

170M2768

250

6250

42000

45

170M2619

170M2669

170M2719

170M2769

315

10000

68500

55

170M2620

170M2670

170M2720

170M2770

350

13500

91500

60

170M2621

170M2671

170M2721

170M2771

400

18000

125000

70

• Watts loss provided at rated current.
• Microswitch indicator ordered separately.
• See accessories on pages 212-213.
• For fuse curves see page 147.

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

Square Body Size 000, 00 — 690V/700V (IEC/UL):  10-400A

1x10

1

10

2

10

3

10

4

1x10

–4

10

–3

10

–2

10

–1

10

0

10

1

10

2

10

3

10

4

Prospective Current In Amps RMS

V

irtual Pre-Arcing 

T

ime In Seconds

10A

16A

20A

25A

32A

40A

50A

63A

80A

100

A

125

A

160

A

200

A

250

A

315

A

A

A

1x10

1

10

2

10

3

10

4

1x10

–4

10

–3

10

–2

10

–1

10

0

10

1

10

2

10

3

10

4

Prospective Current in Amps RMS

V

irtual Pre-Arcing 

T

ime In Seconds

25A

32A

40A

50A

63A

80A

100

A

125

A

160

A

200

A

250

A

315

A

350

A

400

A

A

A

Size 00 — 25-400A: 690V

Time-Current Curve

Size 000 — 10-315A: 690V

Time-Current Curve

1x10

1

10

2

10

3

10

4

10

5

2x10

1

10

2

10

3

10

4

Prospective Short-Circuit Current Symmetrical RMS

P

eak Let-Through Current

10A

16A

20A

25A

32A

40A

50A

63A

80A

100A

125A

160A

200A

250A

A

B

315A

1x10

1

10

2

10

3

10

4

10

5

2x10

1

10

2

10

3

10

4

Prospective Short-Circuit Current Symmetrical RMS

P

eak Let-Through Current

25A

32A

40A

50A

63A

80A

100A

125A

160A

200A

250A

315A

350A

400A

A

B

Peak Let-Through Curve

Peak Let-Through Curve

Data Sheet: 17056310

Data Sheet: 172056312

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147

High Speed

Fuses

High Speed Fuses

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148

High Speed Fuses

Square Body DIN 43 620 — 690V (IEC/UL):  10-315A

690V (IEC/UL) 10-315A

Specifications

Description:

Square body DIN 43

620 blade style high speed fuses.

Dimensions:

See dimensions

illustration.

Ratings:

Volts: — 690Vac

Amps: — 10-315A

IR: — 200kA RMS Sym.

Agency Information: 

CE, Designed and tested to IEC

60269: Part 4. UL Recognized E125085.JFHR2. & CSA
Component Acceptance file Class 1422-30, (53787)

Electrical 
Characteristics

Total Clearing I

2

t

The total clearing I

2

t at

rated voltage and at power
factor of 15% are given in
the electrical characteris-
tics. For other voltages,
the clearing I

2

t is found by

multiplying by correction
factor, K, given as a func-
tion of applied working
voltage, Eg, (rms).

54 Ma

x

79

48

21

6

35

15

I

ndicator

Dimensions - mm

DIN 000 Type T

1mm = 0.0394” / 1” = 25.4mm

Arc Voltage

This curve gives the peak
arc voltage, UL, which

may appear across the
fuse during its operation
as a function of theapplied
working voltage, Eg, (rms)

at a power factor of 15%.

Power Losses

Watts loss at rated current
is given in the electrical
characteristics. The curve
allows the calculation of
the power losses at load
currents lower than the
rated current. The correc-
tion factor, Kp, is given as

a function of the RMS load
current, Ib, in % of the

rated current.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

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149

Catalog Numbers

Catalog Numbers
DIN

Electrical Characteristics

Type T

Rated

I

2

t (A

2

Sec)

Indicator

Current

Clearing

Watts

for Micro

Size

RMS-Amps

Pre-arc

at 660V

Loss

170M1558D

10

4

27

2.5

170M1559D

16

7

51

4

170M1560D

20

11.5

82.5

5

170M1561D

25

19

140

6

170M1562D

32

40

285

7

170M1563D

40

65

490

8.5

170M1564D

000

50

115

815

9.5

170M1565D

63

215

1550

11.5

170M1566D

80

380

2700

15

170M1567D

100

695

4950

16.5

170M1568D

125

1180

8250

21.5

170M1569D

160

2300

16500

25

170M1570D

200

4350

31000

29.5

170M1571D

250

7900

56000

35.5

170M1572D

00

315

12000

84500

45

• Watts loss provided at rated current.
• Microswitch indicator ordered separately. See accessories on pages 212-213.

Rated Current

The rated current of this fuse range has been given with 
copper conductors that have a current density of 1.3A/mm

2

(IEC 60269-4). For conductor cross section according to IEC
60269-1, the fuses with a rated current higher than 125A
must be derated. Please contact Bussmann for 
application assistance.

Square Body DIN 43 620 — 690V (IEC/UL):  10-315A

Size 000 — 10-315A: 690V

Time-Current Curve

Peak Let-Through Curve

Data Sheet: 72056310

High Speed

Fuses

High Speed Fuses

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High Speed Fuses

150

Square Body DIN 43 653 — 690V/700V (IEC/UL):
40-2000A

690V/700V (IEC/UL)  40-2000A

Specifications

Description: Square body DIN 43
653 stud-mount high speed fuses.

Dimensions:

See dimensions

illustration.

Ratings:

Volts: — 690Vac (IEC)

— 700Vac (UL)

Amps: — 40-2000A

IR: — 200kA RMS Sym.

Agency Information:

CE,

Designed and tested to  IEC
60269: Part 4. UL Recognized
E125085.JFHR2, CSA Certified:
Class 53787, File 1422-30.

Electrical 
Characteristics

Total Clearing I

2

t

The total clearing I

2

t at

rated voltage and at power
factor of 15% are given in
the electrical 
characteristics. For other
voltages, the clearing I

2

t is

found by multiplying by
correction factor, K, given
as a function of applied
working voltage, Eg, (rms).

Arc Voltage

This curve gives the peak
arc voltage, UL, which

may appear across the
fuse during its operation
as a function of theapplied
working voltage, Eg, (rms)

at a power factor of 15%.

Power Losses

Watts loss at rated current
is given in the electrical
characteristics. The curve
allows the calculation of
the power losses at load
currents lower than the
rated current. The 
correction factor, Kp, is

given as a function of the
RMS load current, Ib, in %

of the rated current.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

U

L

1.4

1.2

10

3

6

8
7

9

5

4

3

E

g

200

300

400

500

600 690

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

100 200 300 400 500 600 690

K

1.5

1.0

0.5

0.4

0.3

0.2

E

g

1)

2)

1) Rated voltage 600V
2) Rated voltage 550V

A

B

C

D

E

E

6

11

H

Dimensions - mm

Size

A

B

B**

C

C**

D***

E

H

1*

50

104

134

78

108

58

45

22

1

50

108

138

78

108

66

53

25

2

50

108

138

78

108

75

61

25

3

51

109

139

78

108

90

76

30

**Valid for fuses type -/110, -TN/110.
***Microswitch.
1mm = 0.0394” / 1” = 25.4mm

Type -KN/80, -KN/110

Type -/80, -TN/80, -/110, -TN/110.

C

B

A

H

11

6

E

E

D

For Other Voltage Ratings in This Body Style  

• See pages 174 (1000V) and 187 (1250V/1300V)

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Square Body DIN 43 653 — 690V/700V (IEC/UL): 
40-2000A

151

Catalog Numbers

-/80

-TN/80

-KN/80

-TN/110

-KN/110

Electrical Characteristics

Visual

Type T

Type K

-/110

Type T

Type K

I

2

t (A

2

Sec)

Watts

Indicator

Indicator

Visual

Indicator

Indicator

Rated

Current

Clearing

Indicator

for Micro

for Micro

for Micro

for Micro

-KN/80

Size

RMS-Amps

Pre-arc

at 660V

Loss

170M3008

170M3058

170M3108

170M3158

170M3208

170M3258

40

40

270

9

170M3009

170M3059

170M3109

170M3159

170M3209

170M3259

50

77

515

11

170M3010

170M3060

170M3110

170M3160

170M3210

170M3260

63

115

770

14

170M3011

170M3061

170M3111

170M3161

170M3211

170M3261

80

185

1250

18

170M3012

170M3062

170M3112

170M3162

170M3212

170M3262

100

360

2450

21

170M3013

170M3063

170M3113

170M3163

170M3213

170M3263

125

550

3700

26

170M3014

170M3064

170M3114

170M3164

170M3214

170M3264

160

1100

7500

30

170M3015

170M3065

170M3115

170M3165

170M3215

170M3265

200

2200

15000

35

170M3016

170M3066

170M3116

170M3166

170M3216

170M3266

1*

250

4200

28500

40

170M3017

170M3067

170M3117

170M3167

170M3217

170M3267

315

7000

46500

50

170M3018

170M3068

170M3118

170M3168

170M3218

170M3268

350

10000

68500

55

170M3019

170M3069

170M3119

170M3169

170M3219

170M3269

400

15000

105000

60

170M3020

170M3070

170M3120

170M3170

170M3220

170M3270

450

21000

140000

65

170M3021

170M3071

170M3121

170M3171

170M3221

170M3271

500

27000

180000

70

170M3022

170M3072

170M3122

170M3172

170M3222

170M3272

550

34000

230000

75

170M3023

170M3073

170M3123

170M3173

170M3223

170M3273

630

48500

325000

80

170M4008

170M4058

170M4108

170M4158

170M4208

170M4258

200

1650

11500

45

170M4009

170M4059

170M4109

170M4159

170M4209

170M4259

250

3100

21000

55

170M4010

170M4060

170M4110

170M4160

170M4210

170M4260

315

6200

42000

58

170M4011

170M4061

170M4111

170M4161

170M4211

170M4261

350

8500

59000

60

170M4012

170M4062

170M4112

170M4162

170M4212

170M4262

400

13500

91500

65

170M4013

170M4063

170M4113

170M4163

170M4213

170M4263

450

17000

120000

70

170M4014

170M4064

170M4114

170M4164

170M4214

170M4264

1

500

25000

170000

72

170M4015

170M4065

170M4115

170M4165

170M4215

170M4265

550

34000

230000

75

170M4016

170M4066

170M4116

170M4166

170M4216

170M4266

630

52000

350000

80

170M4017

170M4067

170M4117

170M4167

170M4217

170M4267

700

69500

465000

85

170M4018

170M4068

170M4118

170M4168

170M4218

170M4268

800

105000

725000

95

170M4019

170M4069

170M4119

170M4169

170M4219

170M4269

‡900

155000

‡850000

100

170M5008

170M5058

170M5108

170M5158

170M5208

170M5258

400

11000

74000

65

170M5009

170M5059

170M5109

170M5159

170M5209

170M5259

450

15500

105000

70

170M5010

170M5060

170M5110

170M5160

170M5210

170M5260

500

21500

145000

75

170M5011

170M5061

170M5111

170M5161

170M5211

170M5261

550

28000

190000

80

170M5012

170M5062

170M5112

170M5162

170M5212

170M5262

630

41000

275000

90

170M5013

170M5063

170M5113

170M5163

170M5213

170M5263

2

700

60500

405000

95

170M5014

170M5064

170M5114

170M5164

170M5214

170M5264

800

86000

575000

105

170M5015

170M5065

170M5115

170M5165

170M5215

170M5265

900

125000

840000

110

170M5016

170M5066

170M5116

170M5166

170M5216

170M5266

1000

180000

1250000

115

170M5017

170M5067

170M5117

170M5167

170M5217

170M5267

1100

245000

1600000

120

170M5018

170M5068

170M5118

170M5168

170M5218

170M5268

1250

365000

2400000

130

170M6008

170M6058

170M6108

170M6158

170M6208

170M6258

500

14000

95000

95

170M6009

170M6059

170M6109

170M6159

170M6209

170M6259

550

19500

135000

100

170M6010

170M6060

170M6110

170M6160

170M6210

170M6260

630

31000

210000

105

170M6011

170M6061

170M6111

170M6161

170M6211

170M6261

700

44500

300000

110

170M6012

170M6062

170M6112

170M6162

170M6212

170M6262

800

69500

465000

115

170M6013

170M6063

170M6113

170M6163

170M6213

170M6263

900

100000

670000

120

170M6014

170M6064

170M6114

170M6164

170M6214

170M6264

3

1000

140000

945000

125

170M6015

170M6065

170M6115

170M6165

170M6215

170M6265

1100

190000

1300000

130

170M6016

170M6066

170M6116

170M6166

170M6216

170M6266

1250

290000

1950000

140

170M6017

170M6067

170M6117

170M6167

170M6217

170M6267

1400

370000

2450000

155

170M6018

170M6068

170M6118

170M6168

170M6218

170M6268

1500

460000

3100000

160

170M6019

170M6069

170M6119

170M6169

170M6219

170M6269

1600

580000

3900000

160

170M6020

170M6070

170M6120

170M6170

170M6220

170M6270

†1800

880000

†5250000

165

170M6021

170M6071

170M6121

170M6171

170M6221

170M6271

‡2000

1150000

‡6350000

175

†Rated voltage (IEC) 600V.
‡Rated voltage (IEC) 550V.
• Watts loss provided at rated current.
• Microswitch indicator ordered separately. See accessories on pages 212-213.
• For fuse curves see pages 158 and 159.

For product data sheets, visit www.cooperbussmann.com/DatasheetsEle

High Speed

Fuses

Catalog Numbers

High Speed Fuses

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

For product data sheets, visit www.cooperbussmann.com/DatasheetsEle

High Speed Fuses

152

Arc Voltage

This curve gives the peak
arc voltage, UL, which

may appear across the
fuse during its operation
as a function of theapplied
working voltage, Eg, (rms)

at a power factor of 15%.

Power Losses

Watts loss at rated current
is given in the electrical
characteristics. The curve
allows the calculation of
the power losses at load
currents lower than the
rated current. The 
correction factor, Kp, is

given as a function of the
RMS load current, Ib, in %

of the rated current.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

Square Body Flush End Contact — 690V/700V (IEC/UL):
40-2000A

K

p

30 40 50

60

70

80 90 100%

I

b

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

690V/700V (IEC/UL)  40-2000A

Specifications

Description:

Square body flush

end contact high speed fuses.

Dimensions:

See dimensions

illustrations.

Ratings:

Volts: — 690Vac (IEC)

— 700Vac (UL)

Amps: — 40-2000A

IR: — 200kA RMS Sym.

Agency Information:

CE, Designed and tested to IEC

60269: Part 4. UL Recognized E125085.JFHR2, CSA
Certified: Class 53787, File 1422-30.

Electrical 
Characteristics

Total Clearing I

2

t

The total clearing I

2

t at

rated voltage and at power
factor of 15% are given in
the electrical 
characteristics. For other
voltages, the clearing I

2

t is

found by multiplying by
correction factor, K, given
as a function of applied
working voltage, Eg, (rms).

A

B

D

E

E

H

G

F

Dimensions - mm

Type -B/-, -BKN/-, -G/-, -GKN/-

Size

A

B

D

E

F

F** (in)

G

H

1*

50

51

59

45

M8

5

⁄

16

” - 18 UNC-2B

5

ø17

1

50

51

69

53

M8

5

⁄

16

” - 18 UNC-2B

8

ø20

2

50

51

77

61

M10

3

⁄

8

” - 16 UNC-2B

10

ø24

3

51

53

92

76

M12

1

⁄

2

” - 13 UNC-2B

10

ø30

**Valid for fuses type -G/- & -GKN/-.
NB: B = 65 for:

Size 2, 1100-1250A
Size 3, 1600-2000A

1mm = 0.0394” / 1” = 25.4mm

U

L

1.4

1.2

10

3

6

8
7

9

5

4

3

E

g

200

300

400

500

600 690

K

1.5

1.0

0.5

0.4

0.3

0.2

E

g

1)

2)

100 200 300 400 500 600 690

1) Rated voltage 600V.
2) Rated voltage 550V

For Other Voltage Ratings in This Body Style  

• See pages 176 (1000V) and 189 (1250V/1300V)

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

153

Square Body Flush End Contact — 690V/700V (IEC/UL):
40-2000A

Catalog Numbers

-BKN/-

-GKN/-

Electrical Characteristics

-B/-

Type K

-G/-

Type K

Rated

I

2

t (A

2

Sec)

Visual

Indicator

Visual

Indicator

Current

Clearing

Watts

Indicator

for Micro

Indicator

for Micro

Size

RMS-Amps

Pre-arc

at 660V

Loss

170M3408

170M3458

170M3508

170M3558

40

40

270

9

170M3409

170M3459

170M3509

170M3559

50

77

515

11

170M3410

170M3460

170M3510

170M3560

63

115

770

14

170M3411

170M3461

170M3511

170M3561

80

185

1250

18

170M3412

170M3462

170M3512

170M3562

100

360

2450

21

170M3413

170M3463

170M3513

170M3563

125

550

3700

26

170M3414

170M3464

170M3514

170M3564

160

1100

7500

30

170M3415

170M3465

170M3515

170M3565

200

2200

15000

35

170M3416

170M3466

170M3516

170M3566

1*

250

4200

28500

40

170M3417

170M3467

170M3517

170M3567

315

7000

46500

50

170M3418

170M3468

170M3518

170M3568

350

10000

68500

55

170M3419

170M3469

170M3519

170M3569

400

15000

105000

60

170M3420

170M3470

170M3520

170M3570

450

21000

140000

65

170M3421

170M3471

170M3521

170M3571

500

27000

180000

70

170M3422

170M3472

170M3522

170M3572

550

34000

230000

75

170M3423

170M3473

170M3523

170M3573

630

48500

325000

80

170M4408

170M4458

170M4508

170M4558

200

1650

11500

45

170M4409

170M4459

170M4509

170M4559

250

3100

21000

55

170M4410

170M4460

170M4510

170M4560

315

6200

42000

58

170M4411

170M4461

170M4511

170M4561

350

8500

59000

60

170M4412

170M4462

170M4512

170M4562

400

13500

91500

65

170M4413

170M4463

170M4513

170M4563

450

17000

120000

70

170M4414

170M4464

170M4514

170M4564

1

500

25000

170000

72

170M4415

170M4465

170M4515

170M4565

550

34000

230000

75

170M4416

170M4466

170M4516

170M4566

630

52000

350000

80

170M4417

170M4467

170M4517

170M4567

700

69500

465000

85

170M4418

170M4468

170M4518

170M4568

800

105000

725000

95

170M4419

170M4469

170M4519

170M4569

‡900

155000

‡850000

100

170M5408

170M5458

170M5508

170M5558

400

11000

74000

65

170M5409

170M5459

170M5509

170M5559

450

15500

105000

70

170M5410

170M5460

170M5510

170M5560

500

21500

145000

75

170M5411

170M5461

170M5511

170M5561

550

28000

190000

80

170M5412

170M5462

170M5512

170M5562

630

41000

275000

90

170M5413

170M5463

170M5513

170M5563

2

700

60500

405000

95

170M5414

170M5464

170M5514

170M5564

800

86000

575000

105

170M5415

170M5465

170M5515

170M5565

900

125000

840000

110

170M5416

170M5466

170M5516

170M5566

1000

180000

1250000

115

170M5417

170M5467

170M5517

170M5567

1100

245000

1600000

120

170M5418

170M5468

170M5518

170M5568

1250

365000

2400000

130

170M6408

170M6458

170M6508

170M6558

500

14000

95000

95

170M6409

170M6459

170M6509

170M6559

550

19500

135000

100

170M6410

170M6460

170M6510

170M6560

630

31000

210000

105

170M6411

170M6461

170M6511

170M6561

700

44500

300000

110

170M6412

170M6462

170M6512

170M6562

800

69500

465000

115

170M6413

170M6463

170M6513

170M6563

900

100000

670000

120

170M6414

170M6464

170M6514

170M6564

3

1000

140000

945000

125

170M6415

170M6465

170M6515

170M6565

1100

190000

1300000

130

170M6416

170M6466

170M6516

170M6566

1250

290000

1950000

140

170M6417

170M6467

170M6517

170M6567

1400

370000

2450000

155

170M6418

170M6468

170M6518

170M6568

1500

460000

3100000

160

170M6419

170M6469

170M6519

170M6569

1600

580000

3900000

160

170M6420

170M6470

170M6520

170M6570

†1800

880000

†5250000

165

170M6421

170M6471

170M6521

170M6571

‡2000

1150000

‡6350000

175

†Rated voltage (IEC) 600V.
‡Rated voltage (IEC) 550V.
• Watts loss provided at rated current.
• Microswitch indicator ordered separately. See accessories on pages 212-213.
• For fuse curves see pages 158 and 159.

For product data sheets, visit www.cooperbussmann.com/DatasheetsEle

High Speed

Fuses

Catalog Numbers

High Speed Fuses

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com

For product data sheets, visit www.cooperbussmann.com/DatasheetsEle

High Speed Fuses

154

Arc Voltage

This curve gives the peak
arc voltage, UL, which

may appear across the
fuse during its operation
as a function of theapplied
working voltage, Eg, (rms)

at a power factor of 15%.

Power Losses

Watts loss at rated current
is given in the electrical
characteristics. The curve
allows the calculation of
the power losses at load
currents lower than the
rated current. The 
correction factor, Kp, is

given as a function of the
RMS load current, Ib, in %

of the rated current.

Features and Benefits

• Excellent DC performance
• Low arc voltage and low energy let-through (I

2

t)

• Low watts loss
• Superior cycling capability

Typical Applications

• DC Common bus
• DC Drives
• Power converters/rectifiers
• Reduced voltage starters

Square Body US Style — 690V/700V (IEC): 
40-2000A

690V/700V (IEC)  40-2000A

Specifications

Description:

Square body US

style high speed fuses.

Dimensions:

See dimensions

illustration.

Ratings:

Volts: — 690Vac (IEC)

— 700Vac (UL)

Amps: — 40-200A

IR: — 200kA RMS Sym.

Agency Information: 

CE, Designed and tested to  IEC

60269: Part 4. UL Recognized E125085.JFHR2, CSA
Certified: Class 53787, File 1422-30.

Electrical 
Characteristics

Total Clearing I

2

t

The total clearing I

2

t at rated

voltage and at power factor
of 15% are given in the 
electrical characteristics. For
other voltages, the clearing
I

2

t is found by multiplying by

correction factor, K, given as
a function of applied working
voltage, Eg, (rms).

B

C2

D

E

E

6

H 

I

C1

A

Dimensions - mm

Type -FU/-, -FKE/-, FU/115-, -FKE/115

Size

A

B

B**

C1

C1**

C2

C2** D

E

H

I

1*

50

110

148

85

123

72

110

59

45

20

10

1

50

136

157

104

126

78

100

69

53

25

14

2

50

135

159

105

125

78

99

77

61

25

14

3

51

135

155

106

125

77

97

92

76

36

16

**Valid for fuses type -FU/115 & -FKE/115.
1mm = 0.0394” / 1” = 25.4mm

K

1.5

1.0

0.5

0.4

0.3

0.2

1)

2)

100 200 300 400 500 600 690

U

L

1.4

1.2

10

3

6

8
7

9

5

4

3

E

g

200

300

400

500

600 690

K

p

1.0
0.8

0.4

0.5

0.6

0.3

0.2

0.1

30 40 50

60

70

80 90 100%

I

b

1) Rated voltage 600V.
2) Rated voltage 550V

For Other Voltage Ratings in This Body Style  

• See pages 178 (1000V) and 191 (1250V/1300V)

Courtesy of Steven Engineering, Inc. - (800) 258-9200 - sales@steveneng.com - www.stevenengineering.com