XJ series open-phase and phase-sequence protection relay, made in the three-phase AC motor open-phase protection and irreversible phase-sequence protection in transmission equipment, with reliable performance, wide application, easy to use and so on. Protector figure connected to the power supply control circuit in the series, that is able to play a protective role, any phase in three-phase circuit fuse open or XJ for the wire has broken the action, controlled excision main circuit of AC contactor contactor coil power supply in order to AC contactor main contactor, motor phase failure protection. When irreversible three-phase equipment (such as pumps, fans, compressors, elevators, motors, etc) found after the phase sequence, or change the power supply lines for maintenance with the original determination wrong phase sequence when, XJ series, also can identify the phase sequence and reliable work, stop the power supply power supply, to protect the device purpose.

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