1.Purposes

QJZ series of mine explosion-proof and safe double-speed, double-circuit vacuum electromagnetic starter is ideal in AC 50 Hz, 1140V, 660V power supply network in coal mines. It can control operations such as start/stop, reverse rotation, double-speed switching etc, on 3-phase squirrel cage AC asynchronous motors or AC double-winding and double-speed motors, and it also can protect power supply circuits of motors.

2.Protective functions

1) ABD8 digital electronic protector is used;
2) The starter has various protective functions of short-circuit, overload, phase loss, current leakage, 
undervoltage, overvoltage and motor overheat etc;
3) Available as a double-speed switch or a double-circuit switch.

3.Technical Features