Fault diagnosis method special for handcart type circuit breaker

The invention discloses a special fault diagnosis method for a handcart-type circuit breaker, and the method comprises the steps: detecting an internal circuit through a preassembled wire and an aviation plug of the handcart-type circuit breaker; the handcart circuit breaker secondary circuit comprises a switching power supply, a secondary wire aviation plug wire detection circuit, an auxiliary switch wiring detection circuit, a travel switch wiring detection circuit and a chassis wiring detection circuit. And the secondary aviation plug wiring detection circuit, the auxiliary switch wiring detection circuit, the travel switch wiring detection circuit and the chassis wiring detection circuit are respectively connected with the switching power supply. According to the special fault diagnosis method for the handcart type circuit breaker, an aviation plug rapid scanning technology is designed in a combined manner according to function division of 58 pins of an aviation plug of the handcart type circuit breaker,