Thermal Fuses

What are thermal fuses?

Thermal fuses, also called thermal cutoffs, are a safety device used in electrical circuits to provide protection against appliances overheating. Thermal fuses are normally supplied in an axial or radial package, although some thermal fuses are now available as a chip.

How do thermal fuses work?

Thermal fuses work in a similar way to electrical cartridge fuses; when the conditions exceed a certain limit, the circuit will be broken. For thermal fuses, the limit is based on temperature. Thermal fuses typically contain a small pellet within them or have a thin piece of wire which melts at a certain temperature. When the pellet or piece of wire melts, the circuit breaks. This is called 'blowing out' or 'burning out'.

Single-use thermal fuses and resettable thermal fuses

Most thermal fuses are single-use and non-resettable. Once the pellet or piece or wire has melted, the thermal fuse will need replacing before you can operate your appliance again. Resettable fuses are available but tend to have a higher upfront cost than single-use counterparts. For resettable fuses, when the wax pellet within melts, the circuit is broken. However, as the appliance cools, the wax pellet will cool and solidify. This will complete the circuit again and your appliance can be used.

What are thermal fuses used for?

Thermal fuses are used to protect appliances from overheating and can be found in domestic and industrial applications. They are a safety device that helps to prevent fires. For example, thermal fuses can be found in hairdryers, tumble dryers and coffee machines.

What is the difference between functioning temperature and holding temperature?

All thermal fuses have a holding temperature rating and functioning temperature rating. These are key measurements to consider when choosing the right thermal fuse for your application. The holding temperature, normally measured in Celsius, defines what temperature the fuse can operate at continuously without blowing. This is the limit of the safe temperature range for the fuse. The functioning temperature is the lowest temperature rating (also in Celsius) at which the thermal fuse will blow and the circuit will break.

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Description Price Maximum Current Functioning Temperature Holding Temperature Lead Orientation Voltage Rating Body Length Body Width Body Height Body Diameter Tolerance Wire Pitch Wire Length Wire Diameter Reset Tolerance
RS Stock No. 712-7301
Mfr. Part No.EYP1BF134
BrandPanasonic
MYR1.886
Each (In a Pack of 10)
units
1 → 4 A +134°C +105°C Axial 250 V ac 6mm - 6mm 2.2mm ±7°C - 38mm 0.53mm -3/+4°C
RS Stock No. 712-7284
Mfr. Part No.EYP2BN109
BrandPanasonic
MYR21.49
1 Pack of 10
Pack(s)
2 → 5 A +114°C +90°C Axial 250 V ac 9mm - 9mm 3mm ±7°C - 38mm 0.6mm ±3°C
RS Stock No. 712-7335
Mfr. Part No.EYP2BH101
BrandPanasonic
MYR1.492
Each (In a Pack of 10)
units
2 → 3.5 A +102°C +75°C Radial 250 V ac 5mm 2.2mm 4mm - ±7°C - 55mm 0.53mm ±3°C
RS Stock No. 712-7329
Mfr. Part No.EYP05BE134
BrandPanasonic
MYR2.087
Each (In a Pack of 10)
units
0.5 → 3 A +134°C +105°C Axial 250 V ac 5mm - 5mm 1.8mm ±7°C - 38mm 0.53mm -3/+4°C
RS Stock No. 712-7339
Mfr. Part No.EYP2BH115
BrandPanasonic
MYR1.697
Each (In a Pack of 10)
units
2 → 3.5 A +115°C +90°C Radial 250 V ac 5mm 2.2mm 4mm - ±7°C - 55mm 0.53mm ±2°C
RS Stock No. 712-7281
Mfr. Part No.EYP2BN099
BrandPanasonic
MYR1.754
Each (In a Pack of 10)
units
2 → 4 A +102°C +75°C Axial 250 V ac 9mm - 9mm 3mm ±7°C - 38mm 0.6mm -3/+4°C
RS Stock No. 712-7341
Mfr. Part No.EYP2BH138
BrandPanasonic
MYR2.61
Each (In a Pack of 10)
units
2 → 3.5 A +139°C +105°C Radial 250 V ac 5mm 2.2mm 4mm - ±7°C - 55mm 0.53mm ±3°C
RS Stock No. 712-7294
Mfr. Part No.EYP2BN143
BrandPanasonic
MYR1.947
Each (In a Pack of 10)
units
2 → 6 A +145°C +120°C Axial 250 V ac - - 9mm 3mm - - 38mm 0.6mm ±2°C
RS Stock No. 712-7348
Mfr. Part No.EYP2BH134
BrandPanasonic
MYR3.166
Each (In a Pack of 10)
units
2 → 3.5 A +134°C +95°C Radial 250 V ac 5mm 2.2mm 4mm - ±7°C - 55mm 0.53mm -3/+4°C
RS Stock No. 712-7354
Mfr. Part No.EYP2MP092AU
BrandPanasonic
MYR6.837
Each (In a Pack of 10)
units
2 A +92°C +60°C Axial 32 V dc 4.2mm 2.7mm 0.64mm - ±7°C - 7.9mm 2.3mm -4/+3°C
RS Stock No. 712-7304
Mfr. Part No.EYP1BF101
BrandPanasonic
MYR5.925
Each (In a Pack of 10)
units
1 → 3.5 A +102°C +75°C Axial 250 V ac 6mm - 6mm 2.2mm ±7°C - 38mm 0.53mm ±3°C
RS Stock No. 712-7345
Mfr. Part No.EYP2BH145
BrandPanasonic
MYR3.716
Each (In a Pack of 10)
units
2 → 4.5 A +145°C +125°C Radial 250 V ac 5mm 2.2mm 4mm - ±7°C - 55mm 0.53mm ±2°C
RS Stock No. 712-7351
Mfr. Part No.EYP2MP098AU
BrandPanasonic
MYR6.795
Each (In a Pack of 10)
units
2 A +98°C +65°C Axial 32 V dc 4.2mm 2.7mm 0.64mm - ±7°C - 7.9mm 2.3mm -2.5/+3°C
RS Stock No. 712-7313
Mfr. Part No.EYP1BF145
BrandPanasonic
MYR5.642
Each (In a Pack of 10)
units
1 → 5 A +145°C +125°C Axial 250 V ac 6mm - 6mm 2.2mm ±7°C - 38mm 0.53mm ±2°C
RS Stock No. 712-7307
Mfr. Part No.EYP1BF115
BrandPanasonic
MYR5.642
Each (In a Pack of 10)
units
1 → 4 A +115°C +90°C Axial 250 V ac 6mm - 6mm 2.2mm ±7°C - 38mm 0.53mm -2/+3°C
RS Stock No. 712-7272
Mfr. Part No.EYP2BN082
BrandPanasonic
MYR3.035
Each (In a Pack of 10)
units
2 → 4 A +86°C +60°C Axial 250 V ac 9mm - 9mm 3mm ±7°C - 38mm 0.6mm ±2°C
RS Stock No. 712-7297
Mfr. Part No.EYP2BN127
BrandPanasonic
MYR3.035
Each (In a Pack of 10)
units
2 → 4 A +134°C +100°C Axial 250 V ac 9mm - 9mm 3mm ±7°C - 38mm 0.6mm ±4°C
RS Stock No. 712-7332
Mfr. Part No.EYP05BE145
BrandPanasonic
MYR6.277
Each (In a Pack of 10)
units
0.5 → 5 A +145°C +125°C Axial 250 V ac 5mm - 5mm 1.8mm ±7°C - 38mm 0.53mm ±2°C
RS Stock No. 712-7290
Mfr. Part No.EYP2BN134
BrandPanasonic
MYR3.595
Each (In a Pack of 10)
units
2 → 6 A +139°C +110°C Axial 250 V ac 9mm - 9mm 3mm ±7°C - 38mm 0.6mm ±3°C
RS Stock No. 712-7310
Mfr. Part No.EYP1BF138
BrandPanasonic
MYR3.595
Each (In a Pack of 10)
units
1 → 5 A +139°C +110°C Axial 250 V ac 6mm - 6mm 2.2mm ±7°C - 38mm 0.53mm ±3°C