Direct-current master control opening device and method for permanent magnet type circuit breaker

The invention relates to the field of permanent magnet circuit breaker safety protection, in particular to a direct-current master control opening device and method for a permanent magnet circuit breaker, which comprises a device wiring terminal, a signal detection loop, a master control opening loop, a delay repeat loop, four diodes, a third relay, a fourth relay, three resistors and a fault alarm loop. The fault alarm loop is composed of an alarm relay, a self-locking button and an audible and visual alarm. The main control opening loop and the circuit breaker body opening loop form a main and standby double-opening operation loop, when the operation of the main control opening loop fails, the main control opening loop is automatically quitted, the delay reaction loop is started, the circuit breaker body opening loop is used for opening operation, and through the two-time opening operation function, the operation efficiency is greatly improved. The failure of refusing to open the circuit breaker caused by t