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. 195-8749
FabrikantnummerNIS6150MT1TXG
FabrikantON Semiconductor
€ 0,499
Each (In a Pack of 50)
Aantal stuks
- - 1 A 5V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
RS-stocknr. 111-7810
FabrikantnummerSWTC-363-3535
FabrikantSelco
€ 1,538
Each (In a Pack of 10)
Aantal stuks
+184°C +159°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS-stocknr. 124-5057
FabrikantnummerA1-5AF
FabrikantLimitor
€ 1,08
Each (In a Pack of 5)
Aantal stuks
+102°C +63°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS-stocknr. 111-7804
FabrikantnummerSWTC-228-3535
FabrikantSelco
€ 1,637
Each (In a Pack of 10)
Aantal stuks
+109°C +84°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS-stocknr. 204-7405
FabrikantnummerQ82 A 70 05 100
FabrikantLimitor
€ 5,28
Each
Aantal stuks
+70°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 797-6046
FabrikantnummerSF 070 R
FabrikantLimitor
€ 0,935
Each (In a Pack of 10)
Aantal stuks
+73°C +58°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS-stocknr. 111-7805
FabrikantnummerSWTC-262-3535
FabrikantSelco
€ 1,637
Each (In a Pack of 10)
Aantal stuks
+128°C +103°C 10 A 250V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS-stocknr. 195-8755
FabrikantnummerNIS6350MT2TXG
FabrikantON Semiconductor
€ 0,617
Each (In a Pack of 250)
Aantal stuks
- - 3 A 5V - NIS6350 - 0.75mm 3.1mm 3.1mm - -
RS-stocknr. 712-7284
FabrikantnummerEYP2BN109
FabrikantPanasonic
€ 0,305
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. 124-5061
FabrikantnummerA4-5AF
FabrikantLimitor
€ 1,088
Each (In a Pack of 5)
Aantal stuks
+130°C +90°C 5 A 250V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS-stocknr. 195-8751
FabrikantnummerNIS6150MT2TXG
FabrikantON Semiconductor
€ 0,499
Each (In a Pack of 50)
Aantal stuks
- - 1 A 5V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
RS-stocknr. 195-8748
FabrikantnummerNIS6150MT1TXG
FabrikantON Semiconductor
€ 0,333
Each (On a Reel of 3000)
Aantal stuks
- - 1 A 5V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
RS-stocknr. 195-8750
FabrikantnummerNIS6150MT2TXG
FabrikantON Semiconductor
€ 0,333
Each (On a Reel of 3000)
Aantal stuks
- - 1 A 5V - NIS6150 - 0.75mm 3.1mm 3.1mm - -
RS-stocknr. 176-9104
FabrikantnummerP82 55 05100
FabrikantLimitor
€ 5,06
Each
Aantal stuks
+55°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. 204-7382
FabrikantnummerQ82 A 55 05 100
FabrikantLimitor
€ 4,27
Each
Aantal stuks
+55°C - 2.5 A 250V ac Radial - - 8mm 17.5mm 4mm 0.51mm 100mm
RS-stocknr. 195-8753
FabrikantnummerNIS6350MT1TXG
FabrikantON Semiconductor
€ 0,582
Each (In a Pack of 250)
Aantal stuks
- - 3 A 5V - NIS6350 - 0.75mm 3.1mm 3.1mm - -
RS-stocknr. 195-8754
FabrikantnummerNIS6350MT2TXG
FabrikantON Semiconductor
€ 0,426
Each (On a Reel of 3000)
Aantal stuks
- - 3 A 5V - NIS6350 - 0.75mm 3.1mm 3.1mm - -
RS-stocknr. 124-5060
FabrikantnummerA4-3AF
FabrikantLimitor
€ 1,044
Each (In a Pack of 5)
Aantal stuks
+130°C +90°C 3 A 250V ac Radial A-3A-F - 6.3mm 6.2mm 2.5mm 0.6mm -
RS-stocknr. 195-8752
FabrikantnummerNIS6350MT1TXG
FabrikantON Semiconductor
€ 0,424
Each (On a Reel of 3000)
Aantal stuks
- - 3 A 5V - NIS6350 - 0.75mm 3.1mm 3.1mm - -
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