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近来市场上出售“电流”型漏电自动掉闸空气开关,使用虽然方便,但不容易维修,造价也较高,而且不适应建筑业野外作业。根据单相手用电动机具容易漏电的情况,我们自制了几套“电压”型三相与单相都可使用的漏电掉闸装置。经近几年来的使用证明,它使用方便,安全可靠,而且造价低,维修方便,因有试验按钮,使用人即使不懂电气,也能
Recently, on the market, the “current” type of automatic leakage current switch has been used. Although it is convenient to use, it is not easy to maintain and the cost is high, and it is not suitable for field operations in the construction industry. According to the situation that single-phase hand-use motor is easy to leak current, we have made several sets of “voltage” type three-phase and single-phase leakage circuit breakers that can be used. The use in recent years has proved that it is easy to use, safe and reliable, and the cost is low, and maintenance is convenient. Because there are test buttons, users can understand even if they do not understand electrical