空开主要的两大功能便是过流保护和过载的过压保护。当然还有别的保护功能例如欠压。用磁脱扣保障功能来避免短路故障问题。磁脱扣有4个等级,分别是A、B、C、D。A:2倍额定电压。B:2-3倍额定电压。C:5-10倍额定电压。D:10-20倍额定电压。
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