Abstract: The present invention discloses an intelligent circuit breaker capable of automatically releasing and tripping in power failure, with an electromagnetic force capable of controllably changing a current direction arranged between a permanent magnetic field force and a mechanical spring force, and three forces are designed on a straight line, the permanent magnet static iron core, the electromagnetic moving iron core and the electromagnetic coil are respectively fixed on the electromagnetic coil framework through a first shaft hole, a second shaft hole and a wire slot, a tripping energy storage spring is sleeved on the tripping transmission rod, a permanent magnet attraction reset shifting fork is arranged in a shifting groove of the tripping transmission rod, and one end of the tripping transmission rod is provided with a tripping connecting rod.