Emergency stop protection circuit of charging pile, charging pile and charging pile system

The utility model relates to an emergency stop protection circuit of a charging pile, the charging pile and a charging pile system. The emergency stop protection circuit of the charging pile comprisesa circuit breaker arranged in the charging pile. The circuit breaker comprises a wire inlet port and a load port. The incoming line ports comprise a live line incoming line port connected to a live line outgoing line port of an upper-level circuit breaker and a zero line incoming line port connected to a zero line outgoing line port of the upper-level circuit breaker. The load port comprises a live wire outlet port and a zero wire outlet port; the live wire outlet port and the zero wire outlet port are respectively connected to the live wire inlet port and the zero wire inlet port through aninternal circuit of the circuit breaker; and a live wire outlet port of the circuit breaker is connected to a zero wire outlet port of a superior circuit breaker through a current-limiting resistor and an emergency stop switch