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Thermal Fuses

ATC Semitec stock SEFUSE thermal fuses which offer thermal protection for rechargeable batteries, electric motors, transformers and electrical appliances – both large and small.  One-shot thermal fuses are defined by their temperature setting and also by their current rating, the maximum continuous current that can be applied.  We also supply PEPI bimetal thermal fuses which offer ultimate high temperature reliability up to 280°C.

What is a Thermal Fuse?

A thermal fuse or thermal cut-off or “tco” is a one-shot, non-resettable, temperature-sensitive device that provides ultimate temperature protection in small appliances and electronic circuits.  Thermal fuses cannot be reset or repaired, they have to be replaced once the original electrical fault that caused them to trip has been rectified.

Thermal fuses are intended as fail safe devices which activate when other safety measures fail to operate, therefore preventing temperatures rising to dangerous levels.

When designing with a thermal fuse, you need to consider the operating current, applied voltage and the duty hours of the appliance it will protect.  The normal running temperature needs to be a minimum of 25°C below the fuse opening temperature including any self-heating due to I²R or current self-heating. The Th (holding temperature) and Tm (maximum temperature) values stated for the fuse should also be taken into account to ensure reliable operation over the required product life.

Call us today on 01606 871680 to discuss your thermal design requirements and using our innovative suppliers and our extensive technical knowledge, we will work with you to provide the optimal solution for your products.