Profile: MCG manufactures surge protection devices for use on AC power and data lines to protect sensitive equipment from the damaging and disrupting effects of lightning, utility switching and other overvoltage transients. MCG TVSS protectors are used in many large industrial and commercial sites to protect critical computer and microprocessor-based equipment at the building entry as well as at the branch and local service panels or deep within the site at the equipment itself. We cater to 120VAC to 600VAC, 1,3 phase, delta, wyes and high leg.