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 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庫存編號 797-6030
製造零件編號SF 229 R
BrandLimitor
HK$7.244
/個 (每包:10個)
單位
+229°C +200°C 15 A 250 V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS庫存編號 116-114
製造零件編號SM 092 A0 2A
BrandLimitor
HK$7.642
/個 (每包:5個)
單位
+97°C +62°C 2 A 250 V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
RS庫存編號 176-9378
製造零件編號SM 110 A0
BrandLimitor
HK$7.15
/個 (每包:5個)
單位
+115°C +80°C 2 A 250 V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
RS庫存編號 712-7348
製造零件編號EYP2BH134
BrandPanasonic
HK$4.208
/個 (每包:10個)
單位
+134°C +95°C 3.5 A 250 V ac Radial - - 4mm 5mm 2.2mm 0.53mm 55mm
RS庫存編號 797-6042
製造零件編號SF 119 R
BrandLimitor
HK$7.784
/個 (每包:10個)
單位
+121°C +106°C 15 A 250 V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS庫存編號 176-9407
製造零件編號SM 146 A0
BrandLimitor
HK$6.184
/個 (每包:5個)
單位
+151°C +116°C 2 A 250 V ac Axial - 2.5mm 9mm - - 0.6mm 38mm
RS庫存編號 111-7805
製造零件編號SWTC-262-3535
BrandSelco
HK$13.652
/個 (每包:10個)
單位
+128°C +103°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS庫存編號 712-7354
製造零件編號EYP2MP092AU
BrandPanasonic
HK$2.954
/個 (每包:10個)
單位
+92°C +60°C 2 A 32 V dc Axial - - 0.64mm 4.2mm 2.7mm 2.3mm 7.9mm
RS庫存編號 797-6052
製造零件編號SF 167 R
BrandLimitor
HK$7.784
/個 (每包:10個)
單位
+167°C +153°C 15 A 250 V ac Axial - 4mm 8.5mm - - 1mm 18.5mm
RS庫存編號 111-7810
製造零件編號SWTC-363-3535
BrandSelco
HK$12.819
/個 (每包:10個)
單位
+184°C +159°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS庫存編號 111-7811
製造零件編號SWTC-421-3535
BrandSelco
HK$13.652
/個 (每包:10個)
單位
+216°C +178°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS庫存編號 124-5061
製造零件編號A4-5AF
BrandLimitor
HK$9.414
/個 (每包:5個)
單位
+130°C +90°C 5 A 250 V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS庫存編號 111-7813
製造零件編號SWTC-464-3535
BrandSelco
HK$13.652
/個 (每包:10個)
單位
+240°C +193°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS庫存編號 712-7339
製造零件編號EYP2BH115
BrandPanasonic
HK$4.208
/個 (每包:10個)
單位
+115°C +90°C 3.5 A 250 V ac Radial - - 4mm 5mm 2.2mm 0.53mm 55mm
RS庫存編號 712-7284
製造零件編號EYP2BN109
BrandPanasonic
HK$3.372
/個 (每包:10個)
單位
+114°C +90°C 5 A 250 V ac Axial - 3mm 9mm 9mm - 0.6mm 38mm
RS庫存編號 124-5062
製造零件編號A8-5AF
BrandLimitor
HK$9.414
/個 (每包:5個)
單位
+150°C +105°C 5 A 250 V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS庫存編號 124-5059
製造零件編號A2-5AF
BrandLimitor
HK$9.414
/個 (每包:5個)
單位
+115°C +75°C 5 A 250 V ac Radial A-5A-F - 8mm 6.6mm 2.6mm 0.6mm -
RS庫存編號 111-7300
製造零件編號STC-183
BrandSelco
HK$12.819
/個 (每包:10個)
單位
+84°C +60°C 10 A 250 V ac Axial STC Series 4mm 10.5mm - - 1.024mm 35mm
RS庫存編號 111-7095
製造零件編號SWTC-183-3535
BrandSelco
HK$13.652
/個 (每包:10個)
單位
+84°C +57°C 10 A 250 V ac Axial SWTC Series 4mm 10mm - - 1mm 35mm
RS庫存編號 176-9306
製造零件編號SF152E
BrandLimitor
HK$7.904
/個 (每包:5個)
單位
+157°C +142°C 10 A 250 V ac Axial - 4.2mm 11mm - - 1mm 55mm