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 fusesMost 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
RS Stock No. 797-6030
Mfr. Part No.SF 229 R
BrandLimitor
SGD1.424
Each (In a Pack of 10)
units
+229°C +200°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS Stock No. 176-9378
Mfr. Part No.SM 110 A0
BrandLimitor
SGD1.646
Each (In a Pack of 5)
units
+115°C +80°C 2 A 250V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
RS Stock No. 797-6052
Mfr. Part No.SF 167 R
BrandLimitor
SGD1.29
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. 116-114
Mfr. Part No.SM 092 A0 2A
BrandLimitor
SGD1.778
Each (In a Pack of 5)
units
+97°C +62°C 2 A 250V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
RS Stock No. 712-7354
Mfr. Part No.EYP2MP092AU
BrandPanasonic
SGD2.048
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
SGD1.288
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. 124-5062
Mfr. Part No.A8-5AF
BrandLimitor
SGD1.59
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. 124-5059
Mfr. Part No.A2-5AF
BrandLimitor
SGD1.59
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. 111-7808
Mfr. Part No.SWTC-306-3535
BrandSelco
SGD2.248
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. 797-6042
Mfr. Part No.SF 119 R
BrandLimitor
SGD1.18
Each (In a Pack of 10)
units
+121°C +106°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS Stock No. 712-7297
Mfr. Part No.EYP2BN127
BrandPanasonic
SGD0.605
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. 797-6061
Mfr. Part No.SF 139 R
BrandLimitor
SGD1.282
Each (In a Pack of 10)
units
+142°C +127°C 15 A 250V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS Stock No. 712-7284
Mfr. Part No.EYP2BN109
BrandPanasonic
SGD6.36
1 Pack of 10
Pack(s)
+114°C +90°C 5 A 250V ac Axial - 3mm 9mm 9mm - 0.6mm 38mm
RS Stock No. 176-9384
Mfr. Part No.SM 126 A0
BrandLimitor
SGD1.39
Each (In a Pack of 5)
units
+131°C +96°C 2 A 250V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
New
RS Stock No. 195-8755
Mfr. Part No.NIS6350MT2TXG
SGD0.115
Each (In a Pack of 250)
units
- - 3 A 5V - NIS6350 - 0.75mm 3.1mm 3.1mm - -
RS Stock No. 111-7300
Mfr. Part No.STC-183
BrandSelco
SGD2.315
Each (In a Pack of 10)
units
+84°C +60°C 10 A 250V ac Axial STC Series 4mm 10.5mm - - 1.024mm 35mm
RS Stock No. 111-7810
Mfr. Part No.SWTC-363-3535
BrandSelco
SGD2.311
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. 712-7332
Mfr. Part No.EYP05BE145
BrandPanasonic
SGD1.504
Each (In a Pack of 10)
units
+145°C +125°C 5 A 250V ac Axial - 1.8mm 5mm 5mm - 0.53mm 38mm
RS Stock No. 111-7803
Mfr. Part No.SWTC-208-3535
BrandSelco
SGD2.396
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. 712-7301
Mfr. Part No.EYP1BF134
BrandPanasonic
SGD0.515
Each (In a Pack of 10)
units
+134°C +105°C 4 A 250V ac Axial - 2.2mm 6mm 6mm - 0.53mm 38mm
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