It is ideal for mines having explosive gases (Methane) and coals, and it is used in AC 50 Hz, 1140(660) V power supply circuit. It can control start, stop, reverse rotation and double-speed switching of many 3-phase AC asyn-chronous inductance motors or many AC double-winding and double-speed motors, and it also can protect motors and their power supply circuits. When it is used to control two AC double-winding and double-speed motors, the other two branches can be standby for high and low speed operation. There-fore, When it is attached in KJ254 mine electric power automatic control and comprehensive measurement and monitor system to realize automatic control on power supply equipments in mining area.

1. All Chinese characters display;
2. Pull-down menu setting;
3. Standard RS485/232 communication interface is attached;
4. Various protective functions for overcurrent, short-circuit, undervoltage, phase loss, current leakage, overvoltage and 3-phase unbalance etc;
5. Real-time display of 3-phase current, system voltage, operating status of circuit, on-line status of circuit and fault types etc;
6. Function of faults searching and faults recording;
7. It is attached in KJ254 mine electric power automatic control and comprehen sive mea surement and monitor system to realize telemetry, telecommunication, remote control and remote Regulation.