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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Omschrijving Prijs Functioning Temperature Holding Temperature Maximum Current Voltage Rating Lead Orientation Series Body Diameter Body Height Body Length Body Width Wire Diameter Wire Length
RS-stocknr. 797-6061
FabrikantnummerSF 139 R
FabrikantLimitor
0,859 €
Each (In a Pack of 10)
Aantal stuks
+142°C +127°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS-stocknr. 176-9182
FabrikantnummerP82 110 05100
FabrikantLimitor
5,06 €
Each
Aantal stuks
+110°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 124-5059
FabrikantnummerA2-5AF
FabrikantLimitor
1,088 €
Each (In a Pack of 5)
Aantal stuks
+115°C +75°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS-stocknr. 176-9384
FabrikantnummerSM 126 A0
FabrikantLimitor
0,60 €
Each (In a Pack of 5)
Aantal stuks
+131°C +96°C 2 A 250V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
RS-stocknr. 111-7300
FabrikantnummerSTC-183
FabrikantSelco
1,538 €
Each (In a Pack of 10)
Aantal stuks
+84°C +60°C 10 A 250V ac Axial STC Series 4mm 10.5mm - - 1.024mm 35mm
RS-stocknr. 797-6058
FabrikantnummerSF 150 R
FabrikantLimitor
0,935 €
Each (In a Pack of 10)
Aantal stuks
+152°C +137°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS-stocknr. 176-9154
FabrikantnummerP82 90 05100
FabrikantLimitor
5,51 €
Each
Aantal stuks
+90°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 176-9081
FabrikantnummerP82 45 05100
FabrikantLimitor
5,13 €
Each
Aantal stuks
+45°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 797-6030
FabrikantnummerSF 229 R
FabrikantLimitor
0,935 €
Each (In a Pack of 10)
Aantal stuks
+229°C +200°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS-stocknr. 204-7483
FabrikantnummerQ82 A 140 05 100
FabrikantLimitor
4,49 €
Each
Aantal stuks
+140°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 176-9097
FabrikantnummerP82 50 05100
FabrikantLimitor
5,13 €
Each
Aantal stuks
+50°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 176-9148
FabrikantnummerP82 80 05100
FabrikantLimitor
5,32 €
Each
Aantal stuks
+80°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 124-5056
FabrikantnummerA1-3AF
FabrikantLimitor
1,05 €
Each (In a Pack of 5)
Aantal stuks
+102°C +40°C 3 A 250V ac Radial A-3A-F - 6.3mm 6.2mm 2.5mm 0.6mm -
RS-stocknr. 176-9205
FabrikantnummerP82 140 05100
FabrikantLimitor
4,16 €
Each
Aantal stuks
+140°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 712-7284
FabrikantnummerEYP2BN109
FabrikantPanasonic
0,372 €
Each (In a Pack of 10)
Aantal stuks
+114°C +90°C 5 A 250V ac Axial - 3mm 9mm 9mm - 0.6mm 38mm
RS-stocknr. 204-7427
FabrikantnummerQ82 A 80 05 100
FabrikantLimitor
5,21 €
Each
Aantal stuks
+80°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 176-9407
FabrikantnummerSM 146 A0
FabrikantLimitor
0,604 €
Each (In a Pack of 5)
Aantal stuks
+151°C +116°C 2 A 250V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
RS-stocknr. 712-7351
FabrikantnummerEYP2MP098AU
FabrikantPanasonic
0,432 €
Each (In a Pack of 10)
Aantal stuks
+98°C +65°C 2 A 32V dc Axial - - 0.64mm 4.2mm 2.7mm 2.3mm 7.9mm
RS-stocknr. 176-9198
FabrikantnummerP82 125 05100
FabrikantLimitor
5,10 €
Each
Aantal stuks
+125°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 116-114
FabrikantnummerSM 092 A0 2A
FabrikantLimitor
1,102 €
Each (In a Pack of 5)
Aantal stuks
+97°C +62°C 2 A 250V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
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