THERMAL TYPE TRIPPING DEVICE AND CIRCUIT BREAKER USING THE SAME

摘要

A thermal type tripping device adapted to trip a circuit in that a bimetal (2) is heated by overcurrent to cause the curving of the bimetal (2), wherein at least part of the surface of the bimetal (2) has a black color or matte black color (7). This makes it possible to measure the temperature of the bimetal (2) with high accuracy by using a non-contact type thermometer. Further, the temperature measuring section (8) of the bimetal is provided with a bend process section (11) whose surface has a matte black color.