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 797-6061
Référence fabricantSF 139 R
MarqueLimitor
0,859 €
Each (In a Pack of 10)
Unité
+142°C +127°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
N° de stock RS 176-9182
Référence fabricantP82 110 05100
MarqueLimitor
5,06 €
Each
Unité
+110°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 124-5059
Référence fabricantA2-5AF
MarqueLimitor
1,088 €
Each (In a Pack of 5)
Unité
+115°C +75°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
N° de stock RS 111-7300
Référence fabricantSTC-183
MarqueSelco
1,538 €
Each (In a Pack of 10)
Unité
+84°C +60°C 10 A 250V ac Axial STC Series 4mm 10.5mm - - 1.024mm 35mm
N° de stock RS 176-9384
Référence fabricantSM 126 A0
MarqueLimitor
0,60 €
Each (In a Pack of 5)
Unité
+131°C +96°C 2 A 250V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
N° de stock RS 797-6058
Référence fabricantSF 150 R
MarqueLimitor
0,935 €
Each (In a Pack of 10)
Unité
+152°C +137°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
N° de stock RS 204-7483
Référence fabricantQ82 A 140 05 100
MarqueLimitor
4,49 €
Each
Unité
+140°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 176-9097
Référence fabricantP82 50 05100
MarqueLimitor
5,13 €
Each
Unité
+50°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 176-9148
Référence fabricantP82 80 05100
MarqueLimitor
5,32 €
Each
Unité
+80°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 797-6030
Référence fabricantSF 229 R
MarqueLimitor
0,935 €
Each (In a Pack of 10)
Unité
+229°C +200°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
N° de stock RS 176-9081
Référence fabricantP82 45 05100
MarqueLimitor
5,13 €
Each
Unité
+45°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 124-5056
Référence fabricantA1-3AF
MarqueLimitor
1,05 €
Each (In a Pack of 5)
Unité
+102°C +40°C 3 A 250V ac Radial A-3A-F - 6.3mm 6.2mm 2.5mm 0.6mm -
N° de stock RS 176-9154
Référence fabricantP82 90 05100
MarqueLimitor
5,51 €
Each
Unité
+90°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
0,604 €
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 204-7427
Référence fabricantQ82 A 80 05 100
MarqueLimitor
5,21 €
Each
Unité
+80°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 176-9205
Référence fabricantP82 140 05100
MarqueLimitor
4,16 €
Each
Unité
+140°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
N° de stock RS 712-7310
Référence fabricantEYP1BF138
MarquePanasonic
0,305 €
Each (In a Pack of 10)
Unité
+139°C +110°C 5 A 250V ac Axial - 2.2mm 6mm 6mm - 0.53mm 38mm
N° de stock RS 712-7351
Référence fabricantEYP2MP098AU
MarquePanasonic
0,456 €
Each (In a Pack of 10)
Unité
+98°C +65°C 2 A 32V dc Axial - - 0.64mm 4.2mm 2.7mm 2.3mm 7.9mm
N° de stock RS 797-6042
Référence fabricantSF 119 R
MarqueLimitor
0,75 €
Each (In a Pack of 10)
Unité
+121°C +106°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
N° de stock RS 176-9198
Référence fabricantP82 125 05100
MarqueLimitor
5,10 €
Each
Unité
+125°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm