Glo-Quartz® controllers are designed to work with our resettable high limit safety circuit . Once tripped, the heater circuit is interrupted and will not re-engage until the heater has cooled down and the user manually presses the "reset" switch. The TC1 and TCD controllers work with practically all Glo-Quartz® heaters. With the polycarbonate NEMA 4X outer box, they can be utilized in wet or corrosive areas. See the catalog pages below for controller variations.