Developed for operating high-power circuits, power relays, which have a contact rating of 20A to 100A, are robust electromechanical switches. They employ heavy magnetic cores that handle inductive loads, like motors and transformers and quit arcing, with silver-cadmium oxide contacts. They are mainly used for industrial motor control, power distribution, and renewable energy inverters. Three-phase power relays are usually furnished with phase-sequence control along with thermal overload protection and are compliant with the high dependability standards IEC 60255-1 for high reliyability systems.