3L12 Bimetal Disc Thermostats White-Rodgers 3L12 Bimetal Disc Thermostats are manual reset discs with quarter-inch quick-connect terminations. These thermostats feature loose-ring and stainless steel mounting brackets with a 90° orientation to mounting holes. These SPST thermostats are available with 15A at 120VAC and 10A at 240VAC resistive ratings. The pilot duty rating for switching is 125VA. White-Rodgers 3L12 thermostats are designed for safety in gas-fired furnaces, unit heaters, and roof-top units.