介绍了多个快开门组合真空电磁起动器的机械闭锁装置，对两种机械闭锁装置优缺点作了对比分析。
The mechanical block system for combined vacuum electromagnetic starter with multiple quick open-door is presented.
介绍QJZ—400/1140（660）矿用隔爆兼本质安全型真空电磁起动器的工作原理、控制、保护及相关性能。
The paper introduces the working principle, control, protection and related performance of QJZ—400/1140(660) mine flameproof and intrinsically safe vacuum electromagnetic starter.
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