ABB主控模块fi830f
热继电器是一种保护电气设备的电器元件,主要用于监测电气设备的温度,当温度超过设定值时,热继电器将切断电路,防止设备因过热而损坏。热继电器的工作原理是过载电流通过热元件后,使双金属片加热弯曲去推动动作机构来带动触点动作,从而将电动机控制电路断开实现电动机断电停车,起到过载保护的作用。鉴于双金属片受热弯曲过程中,热量的传递需要较长的时间,因此,热继电器不能用作短路保护,而只能用作过载保护热继电器的过载保护。
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