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 Priced to Clear
RS Stock No. 712-7297
Mfr. Part No.EYP2BN127
BrandPanasonic
£0.218
Each (In a Pack of 10)
Units
+134°C +100°C 4 A 250V ac Axial - 3mm 9mm 9mm - 0.6mm 38mm -
RS Stock No. 712-7310
Mfr. Part No.EYP1BF138
BrandPanasonic
£0.173
Each (In a Pack of 10)
Units
+139°C +110°C 5 A 250V ac Axial - 2.2mm 6mm 6mm - 0.53mm 38mm -
RS Stock No. 797-6052
Mfr. Part No.SF 167 R
BrandLimitor
£0.678
Each (In a Pack of 10)
Units
+167°C +153°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm -
RS Stock No. 712-7354
Mfr. Part No.EYP2MP092AU
BrandPanasonic
£0.266
Each (In a Pack of 10)
Units
+92°C +60°C 2 A 32V dc Axial - - 0.64mm 4.2mm 2.7mm 2.3mm 7.9mm -
RS Stock No. 124-5058
Mfr. Part No.A2-3AF
BrandLimitor
£0.678
Each (In a Pack of 5)
Units
+115°C +78°C 3 A 250V ac Radial A-3A-F - 6.3mm 6.2mm 2.5mm 0.6mm - -
RS Stock No. 124-5060
Mfr. Part No.A4-3AF
BrandLimitor
£0.736
Each (In a Pack of 5)
Units
+130°C +90°C 3 A 250V ac Radial A-3A-F - 6.3mm 6.2mm 2.5mm 0.6mm - -
RS Stock No. 124-5059
Mfr. Part No.A2-5AF
BrandLimitor
£0.682
Each (In a Pack of 5)
Units
+115°C +75°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm - -
RS Stock No. 111-7811
Mfr. Part No.SWTC-421-3535
BrandSelco
£1.26
Each (In a Pack of 10)
Units
+216°C +178°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm -
RS Stock No. 712-7351
Mfr. Part No.EYP2MP098AU
BrandPanasonic
£0.372
Each (In a Pack of 10)
Units
+98°C +65°C 2 A 32V dc Axial - - 0.64mm 4.2mm 2.7mm 2.3mm 7.9mm -
RS Stock No. 124-5062
Mfr. Part No.A8-5AF
BrandLimitor
£0.852
Each (In a Pack of 5)
Units
+150°C +105°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm - -
RS Stock No. 111-7803
Mfr. Part No.SWTC-208-3535
BrandSelco
£1.26
Each (In a Pack of 10)
Units
+98°C +73°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm -
RS Stock No. 712-7326
Mfr. Part No.EYP05BE115
BrandPanasonic
£0.285
Each (In a Pack of 10)
Units
+115°C +95°C 3 A 250V ac Axial - 1.8mm 5mm - - 0.53mm 38mm -
RS Stock No. 124-5057
Mfr. Part No.A1-5AF
BrandLimitor
£0.834
Each (In a Pack of 5)
Units
+102°C +63°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm - -
RS Stock No. 111-7804
Mfr. Part No.SWTC-228-3535
BrandSelco
£1.26
Each (In a Pack of 10)
Units
+109°C +84°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm -
RS Stock No. 111-7095
Mfr. Part No.SWTC-183-3535
BrandSelco
£1.26
Each (In a Pack of 10)
Units
+84°C +57°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm -
RS Stock No. 111-7808
Mfr. Part No.SWTC-306-3535
BrandSelco
£1.182
Each (In a Pack of 10)
Units
+152°C +127°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm -
RS Stock No. 712-7332
Mfr. Part No.EYP05BE145
BrandPanasonic
£0.274
Each (In a Pack of 10)
Units
+145°C +125°C 5 A 250V ac Axial - 1.8mm 5mm 5mm - 0.53mm 38mm Yes
RS Stock No. 111-7813
Mfr. Part No.SWTC-464-3535
BrandSelco
£1.26
Each (In a Pack of 10)
Units
+240°C +193°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm -
RS Stock No. 111-7810
Mfr. Part No.SWTC-363-3535
BrandSelco
£1.182
Each (In a Pack of 10)
Units
+184°C +159°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm -
RS Stock No. 195-8751
Mfr. Part No.NIS6150MT2TXG
£0.45
Each (In a Pack of 50)
Units
- - 1 A 5V - NIS6150 - 0.75mm 3.1mm 3.1mm - - -
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