Thermal cut-out 
 Thermal fuse 

J

J

Household appliances

J

J

Electronic appliances

J

J

Fan heaters

J

J

Transformers

J

J

Automotive industry

Applications

J

J

Small compact designs

J

J

Broad product line

J

J

Temperature range up to 240°C

J

J

Custom-made executions 

Benefits

  

type

   HDM

   MT

   SDF

   S3M

Fuses of this type are highly universally applicable due to their small design and 
the  wide range of current-carrying capacity. They are found in all industries 
with electro-technical applications.
The portfolio ranges from the miniature fuse S3M7 with a Ø 3 mm and length 
of 10 mm, up to the robust S3M8 with a current load capacity of up to 25 A. And 
the so-called high-current fuses S3M5 and S3M8 can be particularly found in 
heating applications of all kinds.
Since the purely wired fuse body usually has to be further processed for the 
respective application (insulation of the body, integration of connecting leads 
and connectors), Microtherm also offers the possibility  of  customer-specific 
designs for these fuses.
Beside these Microtherm offers the MT series in axial and radial shape as a 
cost-effective solution for a wide range of applications. These thermal fuses are 
based on melting wire design whereas technical data is given in the tables on the 
right page.
The portfolio of thermal fuses is fulfilled by the HDM series which is a robust 
surface mounting device.

  Description    

S3M7     5A

S3M4     10A

SDFS/SDFL     15A

S3M5     20A

S3M8     25A

metal housing

size A (00): 63,8
size A (01): 82,9

size B (S): 25,4

size B (L): 35

size A (00): 63,8
size A (01): 82,9

size A (00): 63,8
size A (01): 82,9

T

f

(tolerance +0 / -10°C)

type

T

h

T

m

type

T

h

T

m

type

T

h

T

m

(VDE)

T

m

(UL)

type

T

h

T

m

type

T

h

T

m

66

-

-

-

-

-

-

DF

42

110

130

-

-

-

-

-

-

70

E7F

55

125

E4A

55

130

-

-

-

-

E5A

55

175

E8A

45

175

72

-

-

-

E4A

57

100

DF

50

115

110

E5A

57

175

E8A

47

175

77

E7F

62

125

E4A

62

125

DF

55

120

110

E5A

62

200

E8A

52

200

84

E7F

69

125

E4A

69

125

DF

60

125

114

E5A

69

200

E8A

59

200

91

-

-

-

-

-

-

DF

57

135

121

-

-

-

-

-

-

93

E7F

78

140

E4A

78

140

-

-

-

-

E5A

78

215

E8A

68

215

98

E7F

83

140

E4A

83

140

DF

76

140

130

E5A

83

215

E8A

73

215

100

E7F

85

130

E4A

85

140

DF

78

135

250

E5A

85

215

-

-

-

104

-

-

-

E4A

89

150

DF

80

150

150

E5A

89

225

E8A

79

225

110

E7F

95

140

E4A

95

150

DF

88

140

140

E5A

95

225

E8A

85

225

117

E7F

102

150

E4A

102

160

-

-

-

-

E5A

102

235

E8A

92

235

119

-

-

-

-

-

-

DF

95

170

170

-

-

-

-

-

-

121

E7F

106

150

E4A

106

160

-

-

-

-

E5A

106

235

E8A

96

235

128

E7F

113

150

E4A

113

205

DF

106

155

155

E5A

113

235

E8A

103

235

141

-

-

-

-

-

-

DF

117

171

171

-

-

-

-

-

-

144

E7F

129

175

E4A

129

240

DF

120

250

250

E5A

129

250

E8A

119

250

152

E7F

137

175

E4A

137

205

DF

128

176

175

E5A

137

250

E8A

127

250

167

E7F

152

200

E4A

154

240

-

-

-

-

E5A

152

285

E8A

142

285

170

-

-

-

-

-

-

DF

146

300

190

-

-

-

-

-

-

172

E7F

157

200

E4A

157

240

-

-

-

-

E5A

157

350

-

-

-

184

E7F

169

200

E4A

169

210

DF

160

300

214

E5A

169

350

E8A

159

350

190

E7F

175

270

E4A

175

310

-

-

-

-

E5A

175

350

-

-

-

192

-

-

-

E4A

177

210

DF

164

290

222

E5A

177

350

E8A

167

350

205

-

-

-

E4A

189

310

-

-

-

-

E5A

189

375

-

-

-

216

-

-

-

E4A

200

375

   DF

1)

191

241

-

E5A

200

375

-

-

-

228

-

-

-

-

-

-

DF

193

300

300

-

-

-

-

-

-

229

-

-

-

E4A

200

375

-

-

-

-

E5A

200

375

E8A

200

375

240

-

-

-

E4A

200

450

DF

200

290

260

E5A

200

375

E8A

200

375

1)

 VDE approved only          Tape + Reel, cut and bent on request

E

A

E

D

B

C

B

A

E

C

D

type

A

B

C

D

E

approvals

MTVS

6,5±0,5

Ø2,1±0,1

2,6 max

Ø0,5±0,05

37±3

UL, cUL, TÜV, CCC

MTKF

6,0±1

Ø1,5±0,1

1,8 max

Ø0,53±0,1

'00' = 38±3; '01' = 68±3

UL, VDE

MTHS

9,0±0,5

Ø2,5±0,5

3,0 max

Ø0,54±0,05

36±3

UL, cUL, TÜV, CCC

MTTF

6,3±1

Ø2,0±0,1

2,3 max

Ø0,53±0,1

'00' = 38±3; '01' = 68±3

UL, VDE

MTCS

11,5±0,5

Ø3,3±0,5

3,8 max

Ø0,80±0,05

35±3

UL, cUL, TÜV, CCC

MTYF

10,0±1

Ø3,0±0,2

3,3 max

Ø0,70±0,1

'00' = 38±3; '01' = 68±3

UL, VDE

T

f

(tolerance  

+0 / -10°C)

type 1A

T

h

T

m

type 2A

T

h

T

m

type 5A    

T

h

T

m

76

MTVS - V0

1)

53

200

MTTF - T0F

2)

 

55

200

MTCS - C0

1)

53

200

86

MTKF - K1F

60

200

MTTF - T1F

2)

60

200

MTCS - C18

61

200

102

MTKF - K2F

80

200

MTTF - T2F

75

200

MTYF - Y2F

70

200

115

MTKF - K3F

99

200

MTTF - T3F

95

200

MTYF - Y3F

90

200

127

MTKF - K4F

110

200

MTTF - T4F

110

200

MTYF - Y4F

100

200

133

MTKF - K13F

110

200

MTHS - H8

111

200

MTCS - C8

108

200

136

MTKF - K5F

115

200

MTHS - H9

112

200

MTCS - C9

111

200

139

MTVS - V13

115

200

MTHS - H13

115

200

MTCS - C13

112

200

145

MTVS - V6

121

200

MTTF - T7F

125

200

MTCS - C6

118

200

150

MTVS - V7

126

200

MTHS - H7

126

200

MTCS - C7

123

200

1)

 only TÜV, CCC          

2) 

only 1A

type

A

B

C

D

E

approvals

MTNF

4,1±0,5

5,2±0,5

2,0±0,3

0,53±0,1

'S' = 36±3; 'L' = 68±3

UL, VDE

MTF

4,1±0,5

5,2±0,5

2,3±0,2

0,50±0,05

56±3

UL, VDE, CCC

MTX

5,8±0,5

5,8±0,5

2,3±0,2

0,54±0,05

64±3

UL, VDE, CCC

MTY

7,0±0,5

6,6±0,5

2,7±0,3

0,80±0,05

63±3

UL, VDE, CCC

MTT

7,5±0,5

8,3±0,5

3,4±0,2

1,05±0,5

38±5

UL, VDE, CCC

MTP

11,5±0,5

10,8±0,5

4,8±0,2

1,60±0,05

39±5

UL, VDE, CCC

T

f

(tolerance  

+0 / -10°C)

type 1A

T

h

T

m

type 3A

T

h

T

m

type 5A    

T

h

T

m

type 15A   

T

h

T

m

type 20A

T

h

T

m

76

MTF - F0

1)

53

200

MTX - X0

1)

 

53

200

MTY - Y0

1)

53

200

-

-

-

-

-

-

86

MTNF - 

N1F

60

200

MTX - X18

61

200

MTY - Y18

1)

61

200

-

-

-

-

-

-

102

MTNF - 

N2F

75

200

MTX - X1

79

200

MTY - Y1

1)

77

200 MTT - T102

72

200

-

-

-

115

MTF - F2

91

200

MTX - X2

91

200

MTY - Y2

89

200 MTT - T115

85

200

MTP - 

P115

82

200

125

MTF - F3

100

200

MTX - X3

3)

100

200

-

-

-

-

-

-

-

-

-

130

MTF - F4

106

200

MTX - X4

106

200

MTY - Y4

103

200

-

-

-

-

-

-

133

MTF - F8

111

200

MTX - X8

111

200

-

-

-

-

-

-

-

-

-

136

MTNF - 

N5F

100

200

MTX - X9

112

200

MTY - Y9

111

200 MTT - T136

106

200

MTP - 

P136

102

200

145

MTF - F6

1)

121

200

MTX - X6

121

200

-

-

-

-

-

-

-

-

-

150

MTF - F7

126

200

MTX - X7

126

200

MTY - Y7

123

200

-

-

-

-

-

-

160

MTF - F16

2)

135

200

MTX - X16

2)

135

200

-

-

-

-

-

-

-

-

-

1)

 not VDE          

2) 

only CCC

T

f

Rated Functioning Temperature: 
The maximum temperature at which the thermal cutoff changes its state of conductivity to open circuit with sensing current as 
the only load. The rated functioning temperature is measured during a temperature rise of approximately 0.5°C per minute.

T

h

Holding Temperature: 
Maximum temperature of the TCO measured at the case end of the thermal cutoff at which the thermal cutoff can be 
maintained for a period of 168 hours without opening. General note: It is advised that TCOs are not exposed to continuous 
operating temperatures in excess of lower than Tf -25°C.

T

m

Maximum Overshoot Temperature: 
The maximum temperature at which the thermal cutoff, having changed its state of conductivity, can be maintained at twice 
rated voltage for a specified period of time, during which its mechanical and electrical properties will not be affected.

B

A

E

C

D

Biegen

Löten

  L

heatsink

B

A

E

C

D

Biegen

Löten

  L

heatsink

E

A

E

D

B

C

Biegen

Löten

  L

heatsink

E

A

E

D

B

C

Biegen

Löten

  L

heatsink

Biegen

Löten

2,3

  17,8

heatsink

Biegen

Löten

2,3

  17,8

heatsink

HDMV, HDMH   15A

HDMV

HDMH

T

f

(Tolerance  

+0 / -10°C)

type

T

h

T

m

approvals

78

DM

62

250

UL, cUL

90

DM

68

250

UL, cUL

99

DM

83

250

UL, cUL

110

DM

86

250

UL, cUL

120

DM

96

250

UL, cUL, VDE

130

DM

112

250

UL, cUL

140

DM

125

250

UL, cUL

150

DM

135

250

UL, cUL, VDE

170

DM

145

250

UL, cUL

182

DM

163

250

UL, cUL

190

DM

170

250

UL, cUL

  Notes for handling of parts    

  Bending leads    

  Soldering leads    

for wire up to ø 1mm 

L >= 3mm

for wire > ø  1mm   

L >= 5mm

Bending radius in general  R >= 1mm

Täschenwaldstr. 3 
75181 Pforzheim 
Deutschland 

Tel.: +49 7231 787-0 
Fax: +49 7231 787-155 

 
info@microtherm.de 
www.microtherm.de

Microtherm GmbH

05/2017-Technical subject to change without notice