Robertshaw Controls/Uniline 620-402 Thermostat Accessory Transformer

The Robertshaw Controls/Uniline 620-402 Thermostat Accessory Transformer converts incoming line voltage to lower control voltages needed to supply the thermostat and control circuits, allowing a safe and controlled electrical supply to system components. It is assembled into the equipment control enclosure in feet and a plate and is connected to primary power lines and secondary control circuits by insulated leads connecting with thermostats, relays, and ignition modules. The transformer has several secondary voltage outputs and includes thermal protection, which connects with control boards and safety circuits to aid in maintaining stable voltage during heating and cooling operation cycles.