... 200,315,400/1140(660) Mining Explosion Poorf Vacuum Electromagnetic Starter, MA, EX, Main parts: CKJ5 vacuum contactor QJZ2-200, ... Vacuum Electromagnetic Starter1. PurposesQJZ2 Mine explosion proof vacuum electromagnetic starter is ideal for use in AC 50 Hz,rated voltage ... adjusted by code-dialing switch and range switch;2). The starter has protective functions of short-circuit , overload, phase loss, ...