Suitable for methane and coal dust explosion hazard environment and a three-phase neutral ungrounded power supply system with a rated frequency of 50 Hz and rated voltage of 1140V, 660V, through flange installation to the secondary side of dry-type transformer, and combining with high pressure vacuum switch to construct load center, work as combined starting control equipment of shearer, scraper, reloader, crusher, spray pump, emulsion pump and so on. Carry out single control, sequence control, single machine double speed control, double machine double speed control upon multiple three phase AC asynchronous motor and double speed double winding motor, and protectmotor and power supply lines.Automatic control of power supply equipment can be realized by using monitoring system in mine.

The function of integrated low voltage protection box, multi-loop starter and illumination signal integrated protection device. Installed to the secondary side of a mobile substation and constructa load center with a high voltage vacuum switch.

Square shell, quick opening structure and modular movement. Simple and reasonable structure and convenient operation.

Combination of WZBQ-8QG microcomputer integrated protection unit, WZBQC integrated control unit and industrial control technology realize the advanced mode of decentralized protection and centralized control, which is of powerful function, stable performance and friendly interface.

The internal data of the combined switch is communicated by optical fiber, which ensures the normal high speed transmission of the signal, and eliminates the phenomena of crash, misoperation and disorder code.

The touch screen of 10 inch TFT color industrial computer is used to display the important parameters such as system voltage, three-phase current, circuit running state, circuit on-line state, fault type and so on.With fault memory and inquiry function. With man-machine interface keyboard, can amend fixed protection value without power failure and various kinds of operations.

With overload, short circuit, leakage latch, undervoltage, broken phase, three-phase imbalance, over-voltage absorption and other protection functions.

Main cavity, incoming cavity, outlet cavity, external lead intrinsically safe cavity, control transformer cavity, each chamber is independent, reasonable layout, safe and convenient maintenance and assembly. Auxiliary power supply of 127V(4kVA),220V(1kVA) is provided, and the line is protected by vacuum contactor and microcomputer integrated protector.

With standard LAN communication interface, it is configured in mine monitoring and monitoring system to realize 4 remote functions, namely telemetry, remote control, remote communication, remote adjustment. Can realize the functions of remote dividing, closing, remote reading of meter, thus to achieve unattended operation in the substation.