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 Functioning Temperature Holding Temperature Maximum Current Voltage Rating Lead Orientation Series Body Diameter Body Height Body Length Body Width Wire Diameter Wire Length
RS Stock No. 124-5057
Mfr. Part No.A1-5AF
BrandLimitor
MYR4.26
Each (In a Pack of 5)
units
+102°C +63°C 5 A 250 V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS Stock No. 797-6064
Mfr. Part No.SF 094 R
BrandLimitor
MYR3.804
Each (In a Pack of 10)
units
+99°C +84°C 15 A 250 V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS Stock No. 712-7339
Mfr. Part No.EYP2BH115
BrandPanasonic
MYR1.782
Each (In a Pack of 10)
units
+115°C +90°C 3.5 A 250 V ac Radial - - 4mm 5mm 2.2mm 0.53mm 55mm
RS Stock No. 124-5059
Mfr. Part No.A2-5AF
BrandLimitor
MYR4.734
Each (In a Pack of 5)
units
+115°C +75°C 5 A 250 V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS Stock No. 176-9328
Mfr. Part No.SF188E
BrandLimitor
MYR3.514
Each (In a Pack of 5)
units
+192°C +177°C 10 A 250 V ac Axial - 4.2mm 11mm - - 1mm 55mm
RS Stock No. 712-7310
Mfr. Part No.EYP1BF138
BrandPanasonic
MYR3.595
Each (In a Pack of 10)
units
+139°C +110°C 5 A 250 V ac Axial - 2.2mm 6mm 6mm - 0.53mm 38mm
RS Stock No. 797-6049
Mfr. Part No.SF 090 R
BrandLimitor
MYR4.257
Each (In a Pack of 10)
units
+94°C +79°C 15 A 250 V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS Stock No. 124-5061
Mfr. Part No.A4-5AF
BrandLimitor
MYR4.26
Each (In a Pack of 5)
units
+130°C +90°C 5 A 250 V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS Stock No. 176-9261
Mfr. Part No.SF119E
BrandLimitor
MYR4.004
Each (In a Pack of 5)
units
+121°C +106°C 10 A 250 V ac Axial - 4.2mm 11mm - - 1mm 55mm
RS Stock No. 176-9306
Mfr. Part No.SF152E
BrandLimitor
MYR3.296
Each (In a Pack of 5)
units
+157°C +142°C 10 A 250 V ac Axial - 4.2mm 11mm - - 1mm 55mm
RS Stock No. 124-5062
Mfr. Part No.A8-5AF
BrandLimitor
MYR3.722
Each (In a Pack of 5)
units
+150°C +105°C 5 A 250 V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS Stock No. 712-7354
Mfr. Part No.EYP2MP092AU
BrandPanasonic
MYR6.837
Each (In a Pack of 10)
units
+92°C +60°C 2 A 32 V dc Axial - - 0.64mm 4.2mm 2.7mm 2.3mm 7.9mm
RS Stock No. 712-7307
Mfr. Part No.EYP1BF115
BrandPanasonic
MYR5.924
Each (In a Pack of 10)
units
+115°C +90°C 4 A 250 V ac Axial - 2.2mm 6mm 6mm - 0.53mm 38mm
RS Stock No. 712-7332
Mfr. Part No.EYP05BE145
BrandPanasonic
MYR6.277
Each (In a Pack of 10)
units
+145°C +125°C 5 A 250 V ac Axial - 1.8mm 5mm 5mm - 0.53mm 38mm
RS Stock No. 712-7288
Mfr. Part No.EYP2BN110
BrandPanasonic
MYR4.513
Each (In a Pack of 10)
units
+115°C +90°C 5 A 250 V ac Axial - 3mm 9mm 9mm - 0.6mm 38mm
RS Stock No. 712-7351
Mfr. Part No.EYP2MP098AU
BrandPanasonic
MYR6.795
Each (In a Pack of 10)
units
+98°C +65°C 2 A 32 V dc Axial - - 0.64mm 4.2mm 2.7mm 2.3mm 7.9mm
RS Stock No. 111-7095
Mfr. Part No.SWTC-183-3535
BrandSelco
MYR7.978
Each (In a Pack of 10)
units
+84°C +57°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS Stock No. 797-6030
Mfr. Part No.SF 229 R
BrandLimitor
MYR3.719
Each (In a Pack of 10)
units
+229°C +200°C 15 A 250 V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS Stock No. 712-7297
Mfr. Part No.EYP2BN127
BrandPanasonic
MYR3.187
Each (In a Pack of 10)
units
+134°C +100°C 4 A 250 V ac Axial - 3mm 9mm 9mm - 0.6mm 38mm
RS Stock No. 797-6046
Mfr. Part No.SF 070 R
BrandLimitor
MYR4.354
Each (In a Pack of 10)
units
+73°C +58°C 15 A 250 V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
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