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. 195-8751
Mfr. Part No.NIS6150MT2TXG
SGD0.903
Each (In a Pack of 50)
units
- - 1 A 5 V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
RS Stock No. 111-7300
Mfr. Part No.STC-183
BrandSelco
SGD2.315
Each (In a Pack of 10)
units
+84°C +60°C 10 A 250 V ac Axial STC Series 4mm 10.5mm - - 1.024mm 35mm
RS Stock No. 176-9104
Mfr. Part No.P82 55 05100
BrandLimitor
SGD7.66
Each
units
+55°C - 2.5 A 250 V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS Stock No. 176-9198
Mfr. Part No.P82 125 05100
BrandLimitor
SGD7.66
Each
units
+125°C - 2.5 A 250 V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS Stock No. 124-5061
Mfr. Part No.A4-5AF
BrandLimitor
SGD1.638
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. 111-7803
Mfr. Part No.SWTC-208-3535
BrandSelco
SGD2.396
Each (In a Pack of 10)
units
+98°C +73°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS Stock No. 797-6064
Mfr. Part No.SF 094 R
BrandLimitor
SGD1.496
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. 797-6055
Mfr. Part No.SF 129 R
BrandLimitor
SGD1.433
Each (In a Pack of 10)
units
+133°C +118°C 15 A 250 V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS Stock No. 195-8749
Mfr. Part No.NIS6150MT1TXG
SGD0.903
Each (In a Pack of 50)
units
- - 1 A 5 V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
RS Stock No. 195-8750
Mfr. Part No.NIS6150MT2TXG
SGD0.657
Each (On a Reel of 3000)
units
- - 1 A 5 V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
RS Stock No. 176-9407
Mfr. Part No.SM 146 A0
BrandLimitor
SGD1.002
Each (In a Pack of 5)
units
+151°C +116°C 2 A 250 V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
RS Stock No. 195-8754
Mfr. Part No.NIS6350MT2TXG
SGD0.832
Each (On a Reel of 3000)
units
- - 3 A 5 V - NIS6350 - 0.75mm 3.1mm 3.1mm - -
RS Stock No. 712-7310
Mfr. Part No.EYP1BF138
BrandPanasonic
SGD0.346
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. 712-7326
Mfr. Part No.EYP05BE115
BrandPanasonic
SGD0.571
Each (In a Pack of 10)
units
+115°C +95°C 3 A 250 V ac Axial - 1.8mm 5mm - - 0.53mm 38mm
RS Stock No. 111-7810
Mfr. Part No.SWTC-363-3535
BrandSelco
SGD2.311
Each (In a Pack of 10)
units
+184°C +159°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS Stock No. 111-7804
Mfr. Part No.SWTC-228-3535
BrandSelco
SGD2.396
Each (In a Pack of 10)
units
+109°C +84°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS Stock No. 111-7805
Mfr. Part No.SWTC-262-3535
BrandSelco
SGD2.466
Each (In a Pack of 10)
units
+128°C +103°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS Stock No. 111-7811
Mfr. Part No.SWTC-421-3535
BrandSelco
SGD2.417
Each (In a Pack of 10)
units
+216°C +178°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS Stock No. 195-8748
Mfr. Part No.NIS6150MT1TXG
SGD0.645
Each (On a Reel of 3000)
units
- - 1 A 5 V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
RS Stock No. 176-9148
Mfr. Part No.P82 80 05100
BrandLimitor
SGD8.23
Each
units
+80°C - 2.5 A 250 V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
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