TWI405381B - - Google Patents

Abstract

This invention is a power interrupting circuit protection structure that has dual temperature sensor (I). The design comprises two independently operated temperature sensing power interrupting devices at two terminals of a circuit loop, a thermal escape device, and a thermal melt circuit device; when the current is over loaded, the circuit is over heated, or the ambient temperature is too high, first the contact spring of thermal escape device will be heat up, deformed and bent backward to cut off electricity; next when the current is over loaded, the circuit is over heated, or the ambient temperature is too high, the thermal escape device is unable, not reacting fast enough, or repeatedly cutting off electricity, or the temperature of a conducting circuit loop continuous to rise, the circuit loop is further ensured to be completely turned off by a melting and fracturing a fusible alloy of a thermal melt circuit device. The two independently operated temperature sensing power interrupting devices of the invention can independently sense temperature and can doubly sensing the temperature to cut off the circuit. The invention allows circuit loop to temporary cut off electricity, re-establish power, or completely turned off. As a result, it can avoid the hazard of a circuit overload, short circuit, or overheated wire and to ensure safety.