【简答题】
空气断路器（自动开关）
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答案
是用手动（或电动）合闸，用锁扣保持合闸位置，由脱扣机构作用于跳闸并具有灭弧装置的低压开关，目前被广泛用于500V以下的交、直流装置中，当电路内发生过负荷、短路、电压降低或消失时，能自动切断电路。
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