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Technical Notes

Guide To Transformers - Thermal Protection
Thermal protection can be built in to our toroidal transformers in the form of thermal sensitive fuses and switches (thermostats). These protectors are generally built inline into the primary winding, and are in close thermal contact with the windings. Thermal fuses are not resettable and once blown cannot be replaced. Thermal switches are designed to open at a set temperature and will close again upon cooling, reforming the primary circuit (with slight hysteresis). These protectors may be required to satisfy certain safety approvals. Customer specified protection can be added in the form of Normally Open switches, as well as incorporation into specific windings. Thermal protection always adds to the cost of toroidals and can affect the transformer geometry slightly. Our engineers are pleased to advise on protection issues.

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