QBZ2-4¡Á120/1140(660) mining explosion proof partial ventilator combination vacuum electromagnet starter(hereafter
it is short for Starter) applies to mine that full of dangerous gas (methane) and coal dusty. The rated voltage is 11 4 0 V or
660V, it can be used to control and protect several counter rotating partial ventilators' combinational operation, so that it can
ensure he heading face's continual cventilation, and reduce none plan stop ventilation events.