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刀开关一般用在额定电压是交流____V、直流____V的电路中作电源隔离用。组合开关的主要技术参数有____、____、允许操作频率、极数等。组合开关用作隔离开关时,其额定电流应____被隔离电路中各负载电流的总和;用于控制电动机时,其额定电流一般取电动机额定电流的1.5~2.5倍。
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