Master controller of mine explosion-proof combined switch

The utility model relates to a master controller of a mine explosion-proof combined switch. The master controller comprises a PLC (Programmable Logic Controller), an optical coupling isolator connected with the PLC, an isolation simplifier, an analog quantity input device and a power source, wherein the PLC is connected with a switching value in the combined switch through the optical coupling isolator, a contactor in the combined switch is controlled by the PLC through the isolation amplifier, and the PLC is connected with current and voltage sensors in the combined switch through the analog quantity input device. The master controller disclosed by the utility model is provided with various drivers for each circuit, has the functions of protection of overvoltage, undervoltage, short circuit, overload, lack of phase, three-phase imbalance and the like, and meets the requirements of rapid underground fault treatment and maintenance.