Thermal trip device, switching device, thermal magnetic circuit breaker and method for protecting an electrical circuit from damage

摘要

A thermal trip device 10 of a thermal magnet circuit breaker for protecting an electrical circuit from damage by overload has a bimetal element 1 arranged with its first end 1.1 at a current conductive element 5, and its second end 1.2 next to a tripping device 2. A snap action device 20 having a preloaded flat spring 3 provides a force transmission from the bimetal element to the tripping device. A switching device 30 with this thermal trip device interrupts a current flow, and a thermal magnetic circuit breaker with this switching device protects an electrical circuit from damage caused by overload or short circuit. A method for protecting an electric circuit from damage by overload by means of a thermal trip device 10 of a thermal magnet circuit breaker is also provided.