Phillips & Temro Industries 3300063 Regulating Thermostat

The Phillips & Temro Industries 3300063 Regulating Thermostat is an inline controller for high-capacity engine coolant circulation heaters. It regulates heater operation by cycling power based on coolant temperature, typically turning the heater on at 120°F (49°C) and off at 140°F (60°C). This creates efficient engine preheating during cold starts while preventing overheating and reducing energy consumption. The device is designed for engine coolant heating systems and is suitable for engine block heater setups and other coolant heating circuits that rely on precise temperature control. It is commonly installed in trucks, heavy equipment, generators, and industrial engines to manage cold-start conditions and maintain optimal operating temperatures. Key specifications include Manufacturer Part Number 3300063 and Brand Phillips & Temro Industries; Product Type Regulating Thermostat; Function: controls heater cycling based on coolant temperature; Temperature Range: 120°F ON / 140°F OFF (49°C / 60°C); Compatibility: high-capacity circulation heaters; Application: engine coolant heating systems; Installation: inline with heater system.