1. Applicable Scope
The device is used in coal mines containing explosive gas(methane) and coal dust. In the three-phase neutral power supply system with rated voltage 660V or 380V, AC50Hz, rated current 30A or 60A, it can control the startup, stop or two-speed switch control of three-phase asynchronous motor or dual-winding motor closely or remotely, and can change the phase sequence after the load motor stops.

2. Product Features
1). The main circuit adopts vacuum contactor, having long-life and reliable performance.
2). Using self-developed microcomputer monitoring device, comprepensive functions, stable and reliable.
3). Can be used singly or combined with two normal starter QJZ-200, or used as two-speed switch for single or combination use to reduce the lines of eletrical connections more convenient.
4). Having a RS485 interface, realizing the four distance functions: Remote measurement, remote signaling, remote regulating, remote control, becoming an important part of digitized mines.
5). Using simple control lines and the fast-open door structure, easy to maintain.

3. Technical Parameters
Model: QJZ-2x200/1140(660)S
Rated voltage: 660V/1140V
Rated current: 400A
The maximum power of control motor: 340kw/660V, 590kw/1140V