1769-PB4
1769-PB4
1769-PB4
结构图中触点2有三对，串联在被保护的三相主电路中。手动扳动按钮为“合”位置（图中未画出），这时触点2由锁键3保持在闭合状态，锁键3由搭钩4支持着。要使开关分断时，扳动按钮为“分”位置（图中未画出），搭钩4被杠杆7顶开（搭钩可绕轴5转动），触点2就被弹簧1拉开，电路分断。
自动开关的自动分断，是由电磁脱扣器6、欠压脱扣器11和热脱扣器12使搭钩4被杠杆7顶开而完成的。电磁脱扣器6的线圈和主电路串联，当线路工作正常时，所产生的电磁吸力不能将衔铁8吸合，只有当电路发生短路或产生很大的过电流时，电磁吸力才能将衔铁8吸合,撞击杠杆7，顶开搭钩4，使触点2断开，从而将电路分断。
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。
备货，备货，降降降，火火火，火火火……
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