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 Maximum Current Functioning Temperature Holding Temperature Lead Orientation Voltage Rating Body Length Body Width Body Height Body Diameter Tolerance Wire Pitch Wire Length Wire Diameter Reset Tolerance
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
10 A +128°C +103°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -
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
10 A +184°C +159°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -
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
10 A +84°C +57°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -
RS庫存編號 111-7807
製造零件編號SWTC-291-3535
BrandSelco
HK$13.652
/個 (每包:10個)
單位
10 A +144°C +119°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -
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
10 A +84°C +60°C Axial 250 V ac - - 10.5mm 4mm - - 35mm 1.024mm -
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
10 A +240°C +193°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -
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
10 A +216°C +178°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -
RS庫存編號 111-7804
製造零件編號SWTC-228-3535
BrandSelco
HK$13.652
/個 (每包:10個)
單位
10 A +109°C +84°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -
RS庫存編號 111-7808
製造零件編號SWTC-306-3535
BrandSelco
HK$12.819
/個 (每包:10個)
單位
10 A +152°C +127°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -
RS庫存編號 111-7803
製造零件編號SWTC-208-3535
BrandSelco
HK$13.652
/個 (每包:10個)
單位
10 A +98°C +73°C Axial 250 V ac - - 10mm 4mm - - 35mm 1mm -