The WHITE RODGERS model 03L11-210 is an Automatic Reset Bimetal Disc Thermostat with a 4-pin configuration. This thermostat is designed to open on temperature rise, providing accurate and reliable control for various heating and cooling applications. The bimetal disc design ensures precise temperature sensing and the automatic reset feature allows for seamless operation, eliminating the need for manual intervention. With its trusted performance and durable construction, the 03L11-210 is an ideal choice for maintaining optimal temperatures in your HVAC systems.