Pellet type thermal cutoff-when ambient temperature of the thermal cutoff rises to its operating temperature,the pellet melts,spring A expand,moving the slide contact away from lead A,then,the electrical circuit is permanently opened.
Alloy type thermal cutoff--when ambient temperature of the thermal cutoff rises to its operating temperature,the fusible alloy melts and,due to the surface tension and the coating of special resin compound,liquefied element condenses into bulb-like shape around the end of each lead.Then,the electrical circuit is permanently opened.
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