Flameproof phase-sensitive short circuit protection feed switch and working method thereof

The invention discloses a flameproof phase-sensitive short circuit protection feed switch and a working method thereof. The flameproof phase-sensitive short circuit protection feed switch mainly comprises a circuit breaker, a control power source part at the power source side of a main loop, a voltage mutual inductor connected at a power-demand side of the main loop of the circuit breaker, a current mutual inductor connected at the power-demand side of the main loop of the circuit breaker, a controller and a gate-opening executive part; the controller consists of a current signal processing circuit, a voltage signal processing circuit, an amplitude-regulating extraction circuit and a digital signal processor; and the control power source part at the power source side of the main loop comprises a circuit which is used for providing a direct-current working power source for the digital signal processor and a circuit which is used for providing a direct-current working power source for the gate-opening executive