Robertshaw 620-403 Transformer Its versatile mounting hardware

Its versatile mounting hardware

While the ST-3 is rated for 2' to 4' spans

ensuring the system shuts down if a flame rollout occurs

preventing ambient air interference during the introduction of span or zero gas

this thermostat locking kit ensures the integrity of your HVAC calibration remains intact against unauthorized tampering

Robertshaw 620-403 Transformer Its versatile mounting hardwareThe Robertshaw 620 403 is a heavy duty single phase open frame transformer designed for reliable power stepping in HVACR control circuits. Engineering for versatility, this 40VA Class 2 transformer converts a 120V AC primary input to a 24V AC secondary output at 50 60 Hz. Built to meet stringent UL 1585 and NEMA standards, it serves as a critical component for powering 24V thermostats, gas valves, and ignition systems. The 620 403 features universal