... protection JVRDphase sequence voltage protection device(Voltage and Phase Relay)Features:1,Phase Loss protection2,Phase sequence protection3, ... operating voltage equipment indispensable protection products. This product complies with GB14085.5-2001 eqv IEC60947-1: 1999 standard. ... : The base is made of rail protectors, equipped with two M4 screw structure, direct and independent installation or ...