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公司名称：广州山思自动化设备有限公司
联 系 人：廖学通 手机：13682280170
电话：020-61989192 传真：020-87635125
商 务 QQ：1838736967 电子邮箱：13682280170@139.com
联系地址：广州市天河区燕岭路123号建设大厦1200室
使用断路器来保护电动机，必须注意电动机（主交流感应电动机）两个特点：其一是具有一定过载能力；其二是起动电流通常是额定电流几倍（可逆运行或反接制动时可达十几倍）。保证电动机可靠运行和顺利起动，选择断路器时应遵循以下原则：
（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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