A tripper for circuit breakers

The invention provides a tripper for circuit breakers. The tripper comprises an EMC circuit coupled with an external power grid, a rectifying circuit coupled with the EMC circuit, a signal sampling circuit and a power circuit coupled with the rectifying circuit, a microprocessor coupled with the signal sampling circuit and the power circuit, a protection circuit coupled with the signal sampling circuit and the microprocessor, and a trip driving circuit coupled with the protection circuit. The tripper is provided with the protection circuit for protecting the trip driving circuit, so that the accuracy and the safety of trip of circuit breakers are guaranteed. 本发明断路器的脱扣器，包括与外部电网耦合的EMC电路，与EMC电路耦合的整流电路，分别与整流电路耦合的信号采样电路和电源电路，与信号采样电路和电源电路耦合的微处理器，与信号采样电路和微处理器耦合的保护电路，与保护电路耦合的脱扣驱动电路。本发明通过保护电路对脱扣驱动电路进行保护，提高断路器脱扣的准确性和安全性能。