（1）按电动机额定电流来确定断路器长延时动作电流整定值。

（2）断路器6倍长延时动作电流整定值可返回时间要长于电动机实际起动时间。

（3）断路器瞬时动作电流整定值：笼型电动机应为8～15倍脱扣器额定电流；绕线型电动机应为3～6倍脱扣器额定电流。

当然，需要频繁起动电动机，断相运行机率不高有断相保护装置，采用熔断器与磁力起动器结合方式来控制和保护，也是比较合适，这种保护方式便于远距离控制。

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