Protective relays are unique microprocessor-based devices that eliminate unnecessary trips, isolate faults, and protect motors and breakers. They provide system information to help you better manage your system. Arizona Electrical Apparatus, Inc. offers several products like GE Multilin, Schweitzer, Square D, ABB, and Eaton relays to meet your exact requirements. We can also test, calibrate, upgrade, retrofit, and network new technology into any of your currently existing relays.