Thermo magnetic trip unit for a circuit breaker and circuit breaker

Abstract

A thermo magnetic trip unit is disclosed for a circuit breaker, in particular for a molded case circuit breaker. In an embodiment, the thermo magnetic trip unit includes a braid plate, a load plate and a heater arranged between the braid plate and the load plate, whereby the braid plate, the load plate and the heater form a current path. In an embodiment, the thermo magnetic trip unit further includes a bimetal positioned on the heater, a rotatable trip bar and an energy storage spring, whereby the trip bar can release the energy storage spring after being touched by the bimetal with certain power. Further, the bimetal is an arched or curved snap action bimetal which snaps over to an opposite direction as soon as a certain temperature is reached. Further, a circuit breaker, in particular molded case circuit breaker, including such thermo magnetic trip unit, is disclosed.

Dependencies are inferred from the claim text.