tr40系列电子式过载继电器用于主回路额定电压交流50hz、400v及以下、额定电流5a至1000a的电路中，做电路和电动机的过载、断相和三相不平衡保护。
tr40系列电子式过载电器有如下特点：脱扣级别分为10a级、10级和20级；与tj40系列交流接触器插接式连接，方便用户接线，节约安装空间；具有手动和自动复位功能；具有手动断开常闭触头的断开检验按钮；脱扣和复位机构无需外接电源，节约电能，方便用户使用。
tr40 series electronic overload relay is used in the circuit of ac50hz,400v(and below), and rated current from 5a to 1000a as a protective component to prevent motor from damage of overload, open circuit and unbalance of three-phase.
tr40 series electronic overload relay has following characteristics:release class:10a, 10, 20:it is convenient to wire for users as it is connected with tj40 series ac contactor adopting plug-in type and save space: manual and auto reset function: testing button for open normal-closed contact manually; there is no need for power for release and reset machine that is welcome.
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