JRS1 series thermal relay is suitable for using in the circuits rated voltage up to 660V, rated current 80A AC 50Hz or 60Hz, for over-voltage protection of A.C. motor. The relay has the differential mechanism and temperature compensation and can plug in CJX2(LC1-D) series A.C. contactor. The product conforms to GB14048.4, IEC60947-4 standard.