TH-K 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.Frequenoy 50Hz,voltage up to 660V,current up to 105A.Several functions provided by these relays are:phase-failure provided by these relays are:phase-failure protaction,temperature compensation ,ON/OFF indication and manual/automatic reset.