描述
接触器互锁：KM1线圈回路串入KM2的常闭辅助触点，KM2线圈回路串入KM1的常闭触点。当正转接触器KM1线圈通电动作后，KM1的辅助常闭触点断开了KM2线圈回路，若使KM1得电吸合，必须先使KM2断电释放，其辅助常闭触头复位，这就防止了KM1、KM2同时吸合造成相间短路，这一线路环节称为互锁环节。
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