JZNC-MPP21E

详情描述：

JZNC-MPP21E

JZNC-MPP21E

JZNC-MPP21E

欠压脱扣器11的线圈并联在主电路上，当线路电压正常时，欠压脱扣器产生的电磁吸力能够克服弹簧9的拉力而将衔铁10吸合，如果线路电压降到某一值以下，电磁吸力小于弹簧9的拉力，衔铁10被弹簧9拉开，衔铁撞击杠杆7使搭钩顶开，则触点2分断电路。当线路发生过载时，过载电流通过热脱扣器的发热元件13而使双金属片12受热弯曲，于是撞杆7顶开搭钩，使触点断开，从而起到过载保护作用。根据不同的用途，自动开关可配备不同的脱扣器。

（3）按结构分类自动开关有式（框架式）和塑料外壳式（装置式）两种。控制线路中常用塑壳式自动开关作为电源引入开关或作为控制和保护不频繁起动、停止的电动机开关，以及用于宾馆、机场、车站等大型建筑的照明电路。其操作方式多为手动，主要有扳动式和按钮式两种。式（框架式）主要用于供配电系统。

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