Patent ID: 9530601
Filing Date: 2016-12-27
CPC Classification: H01H

Claim Text:
1. Thermo magnetic trip unit for a circuit breaker, comprising: a braid plate; a load plate; a heater arranged between the braid plate and the load plate, the braid plate, the load plate and the heater forming a current path; a bimetal strip fixed to the heater at a first longitudinal end of the bimetal strip, the bimetal strip being an arched or curved snap action bimetal strip configured to snap over to an opposite direction at a calibrated temperature of the bimetal strip, the temperature being dependent upon a current flowing to the current path; an energy storage spring; and a rotatable trip bar, configured to release the energy storage spring after being touched by a second longitudinal end of the bimetal strip with certain power, wherein the snap action bimetal strip is formed such that, in a normal position, the second longitudinal end of the snap action bimetal strip is bent away from the trip bar, wherein the bimetal strip is formed such that the bimetal strip remains in the normal position upon the current, flowing through the current path, varying from 0% to 105% of the nominal current.