A breaker mechanism has its own control circuit

which often conflicts with the protective operation box in function. If the control circuit cannot coordinate with the box

the safe and stable operation of power grid and circuit breakers will be affected. In this paper

the characteristics of anti-tripping circuit

low-pressure locking of tripping and closing

and non-whole-phase protection circuit are analyzed and summarized. Some methods for their coordination are proposed

such as connecting a contact of "Local/Remote" switch handle ZK in the ant-tripping circuit in mechanism box; the functions of low-pressure locking tripping

closing and operating being implemented by the breaker body; only first operating power being selected for low-pressure locking of reclosure circuit; and adopting non-whole-phase protection in the breaker body

while taking the electrical quantities based non-wholephase protection as a supplement. These methods may enhance reliable operation of the circuit breaker to ensure the safe and stable operation of the power system.