Open -phase protector for motor

The utility model relates to an open -phase protector for motor comprises condenser sampling reduction voltage circuit, diode rectifier circuit, relay and ac contactor. The utility model discloses reliable operation, longe -lived, low power dissipation, the various abominable operational environment of adaptation, open -phase protection ware circuit is simple, easily the preparation, low price, installation wiring convenience, can not bring negative effects for the motor, thoroughly solve the motor caused the damage because of the loss of phase problem. 本实用新型涉及种电动机断相保护器，由电容器采样降压电路、二极管整流电路、继电器和交流接触器组成。本实用新型工作可靠、寿命长、功耗低、适应各种恶劣工作环境；断相保护器电路简单，易于制作；价格低廉、安装接线方便；不会给电动机带来负面影响，彻底解决电动机因断相造成损坏的问题。