The SC–40C Satellite Contactor answers the need for cost effective modular snow melting heater control. One or more SC–40Cs, when used with an APS–4C Control Panel acting as the master control, allow for modular snow melting system design. The adjustable hold-on timer continues heater operation on each SC–40C for up to 10 hours after snow stops to ensure complete melting and to compensate for differences between zones.