Arc Flash Protection Arc Flash Protection Arc Guard System TVOC-2Arc Guard System™ TVOC-2 - Safety for your most valuable resources REA Arc Fault Detection SystemThe REA family of relays is designed to protect medium and low voltage air-insulated switchgear against arc incidents. Ultra-Fast Earthing Switch UFESUsing optical sensors and current measurement, UFES extinguishes arc flash in less than 4 ms, 20 times faster than standard arc flash protection. Other Arc Flash Protection & Current Limiters Medium Voltage Fault Current Limiters