FUSES
/ SICHERUNGEN
PFRT
Resettable fuses
www.schurter.com
21
Typical Time to Trip at 23 ˚C
Time to trip
(s)
Dimensions
Applications
Used as a secondary overcur-
rent protection device in:
• Customer Premise Equipment
(CPE)
• Central Office (CO)
• Subscriber Line Interface
Cards (SLIC)
Test Procedures And Requirements For Model PFRT Series
Test
/ Test
Test Conditions
/ Bedingungen
Accept/Reject Criteria
Visual/Mech.
/ visuell/mech.
Verify dimensions and materials
/ Kontrolle Abmess./Mat.
Per MF physical description
Resistance
/ Widerstand
In still air @ 23 °C
/ bei ruhiger Luft 23 °C
R
min
≤
R
≤
R
max
Time to Trip
/ Trip-Zeit
5 times I
hold
, V
max
23 °C
/ 5-facher Haltestrom
T
≤
max.
time to trip
(sec.
)
Hold Current
/ Haltestrom
30 min. at I
hold
/ bei Haltestrom
No trip
Trip Cycle Life
/ Trip-Zyklen
V
max
, I
max
, 100 cycles
/ Zyklen
No arcing or burning
Trip Endurance
/ Zeit im Tripzustand
V
max
, 48 hours
/ Stunden
No arcing or burning
Environmental Characteristics
Operating/Storage Temperature
/ Einsatz/Lagertemp.
-45 °C
to
+85 °C
Maximum Device Surface Temperature in Tripped State
/
125 °C
Passive Aging
/ passive Alterung
+85 °C, 1000
hours
/ Std.
± 2%
typ. resist. change
+60 °C, 1000
hours
/ Std.
± 3%
typ. resist. change
Humidity Aging
/ Feuchtigkeitsalterung
+85 °C, 85% R.H. 500
hours
/ Std.
± 3%
typ. resist. change
Thermal Shock
/ Thermischer Schock
MIL-STD-202F, Method 107G ±10%
typ. resist. change
+125 °C/–55 °C, 10
times
/ Zyklen
±15%
typ. resist. change
Solvent Resistance
/ Lösungsmittel-Beständigkeit
MIL-STD-202, Method 215B
No change
Lead Solerability
/ Lötbarkeit
ANSI/J-STD-002
Flammability
/ Entflammbarkeit
IEC 695-2-2
No Flame for 60 sec.
Vibration
MIL-STD-883C, Method 2007.1,
No change
Condition A
Typical Part Marking
Layout may vary
Manufacturer’s Trademark
Restance bin
Lot No. (T = Taiwan, S = Xiamen)
Part identification
Date code (First digit = Last digit of
year; next three digits = day of year)
50 75 100
Fault current
(A)
100
100
10
1
0.10
0.01
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
PFRT.018.250.U
PFRT.014.250 & PFRT.014.250.U
PFRT.012.250 & PFRT.012.250.U
PFRT.011.250.U
PFRT.008.250 & PFRT.008.250.U
A
E
B
C
D
Wire leaded
PTC-Fuses
Type PFRT
High voltage surge
capabilities
Compliance to ITU
K.20/K.21 specifications
Agency recognition:
UL, CSA, TÜV