Backup protection circuit breaker

The utility model provides a backup protection circuit breaker, which comprises a shell, an operating mechanism, a coil assembly and an air discharge tube used for releasing surge energy are arranged in the shell, the coil assembly is positioned on one side of the operating mechanism, and the air discharge tube is positioned below the operating mechanism or positioned on one side, far away from the coil assembly, of the operating mechanism. The coil assembly is connected with the air discharge tube in parallel, so that the problem of inductive residual voltage of an inductor of an instantaneous coil caused by excessive current of lightning of a common circuit breaker can be solved, the residual voltage of a whole protection loop is reduced, and a better lightning protection effect can be achieved; therefore, the structure of the existing circuit breaker is not affected, and the cost is reduced. 本实用新型提供一种后备保护断路器，包括壳体，壳体内具有操作机构，以及线圈组件和用于电涌能量泄放的空气放电管，线圈组件位于操作机构的一侧，空气放电管位于操作机构的下方，或位于操作机构远离线圈组件的一侧，线圈组件与空气放电管并联连接，这