JRS5 Thermal relays are suitable for overload protection of A.C.motor operated on 8-houres duty or uninterrupted duty. The overload protected A.C. motor with. Frequency 50Hz, voltage up to 660V, current up to 105A. Several functions provided by these relays are: phase-failure protection, temperature compensation, ON/OFF indication and manual/automatic reset. The product conforms to GB14048.4, IEC60947-4 standard.