ProMelt Snow Melting Contactor Pro Expansion CP-50 - 50 Amp The contactor Pro panels are complete 'turn-key' solutions for activating larger system of ProMelt Mats and Cables when used in combination with PM-224, PM-824 or PM-HSC5 snow detector. They're available in three panel sizes 50 Amps, 100 Amps, and 200 Amps, An additional 200-amp extension panel allows coverage for even larger system. 120V, 208V, 240V or 270Volt is supplied to the panel and a 24V Class 2 transformer allows connection to the snow detector. Each Contactor Pro panel is complete with 'system on' indicator light, manual override by a 4-hr timer, simple 24V wire terminal connection to the snow detector, and outputs for connection to an extension panel. The CP-200 has four 50-amp contactors. Systems should be designed to connect one or more ProMelt cables or Mats in combination not to exceed the capacity of individual 50-amp contactors. Each panel is nema type 1 for mounting indoors on a wall, has knock bouts for conduit, and measures 12' x 12' x 4' SunTouch ProMelt Installation Manual SunTouch 25 years Warranty