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 Prix Functioning Temperature Holding Temperature Maximum Current Voltage Rating Lead Orientation Series Body Diameter Body Height Body Length Body Width Wire Diameter Wire Length
N° de stock RS 204-7427
Référence fabricantQ82 A 80 05 100
MarqueLimitor
4,96 €
Each
Unité
+80°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 176-9407
Référence fabricantSM 146 A0
MarqueLimitor
0,586 €
Each (In a Pack of 5)
Unité
+151°C +116°C 2 A 250V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
N° de stock RS 124-5058
Référence fabricantA2-3AF
MarqueLimitor
0,792 €
Each (In a Pack of 5)
Unité
+115°C +78°C 3 A 250V ac Radial A-3A-F - 6.3mm 6.2mm 2.5mm 0.6mm -
N° de stock RS 111-7810
Référence fabricantSWTC-363-3535
MarqueSelco
1,508 €
Each (In a Pack of 10)
Unité
+184°C +159°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
N° de stock RS 124-5061
Référence fabricantA4-5AF
MarqueLimitor
1,088 €
Each (In a Pack of 5)
Unité
+130°C +90°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
N° de stock RS 712-7326
Référence fabricantEYP05BE115
MarquePanasonic
0,326 €
Each (In a Pack of 10)
Unité
+115°C +95°C 3 A 250V ac Axial - 1.8mm 5mm - - 0.53mm 38mm
N° de stock RS 712-7301
Référence fabricantEYP1BF134
MarquePanasonic
0,29 €
Each (In a Pack of 10)
Unité
+134°C +105°C 4 A 250V ac Axial - 2.2mm 6mm 6mm - 0.53mm 38mm
N° de stock RS 111-7811
Référence fabricantSWTC-421-3535
MarqueSelco
1,605 €
Each (In a Pack of 10)
Unité
+216°C +178°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
N° de stock RS 195-8754
Référence fabricantNIS6350MT2TXG
0,416 €
Each (On a Reel of 3000)
Unité
- - 3 A 5V - NIS6350 - 0.75mm 3.1mm 3.1mm - -
N° de stock RS 797-6055
Référence fabricantSF 129 R
MarqueLimitor
0,935 €
Each (In a Pack of 10)
Unité
+133°C +118°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
N° de stock RS 797-6049
Référence fabricantSF 090 R
MarqueLimitor
0,935 €
Each (In a Pack of 10)
Unité
+94°C +79°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
N° de stock RS 195-8748
Référence fabricantNIS6150MT1TXG
0,326 €
Each (On a Reel of 3000)
Unité
- - 1 A 5V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
N° de stock RS 124-5062
Référence fabricantA8-5AF
MarqueLimitor
1,088 €
Each (In a Pack of 5)
Unité
+150°C +105°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
N° de stock RS 797-6046
Référence fabricantSF 070 R
MarqueLimitor
0,935 €
Each (In a Pack of 10)
Unité
+73°C +58°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
N° de stock RS 176-9104
Référence fabricantP82 55 05100
MarqueLimitor
4,96 €
Each
Unité
+55°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 195-8749
Référence fabricantNIS6150MT1TXG
0,499 €
Each (In a Pack of 50)
Unité
- - 1 A 5V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
N° de stock RS 195-8752
Référence fabricantNIS6350MT1TXG
0,414 €
Each (On a Reel of 3000)
Unité
- - 3 A 5V - NIS6350 - 0.75mm 3.1mm 3.1mm - -
N° de stock RS 111-7808
Référence fabricantSWTC-306-3535
MarqueSelco
1,508 €
Each (In a Pack of 10)
Unité
+152°C +127°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
N° de stock RS 111-7813
Référence fabricantSWTC-464-3535
MarqueSelco
1,605 €
Each (In a Pack of 10)
Unité
+240°C +193°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
N° de stock RS 195-8753
Référence fabricantNIS6350MT1TXG
0,568 €
Each (In a Pack of 250)
Unité
- - 3 A 5V - NIS6350 - 0.75mm 3.1mm 3.1mm - -