Robertshaw 620-403 Transformer Its versatile mounting hardware

Its versatile mounting hardware

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

0000 is the standard replacement for the FMD-1

restoring the vacuum necessary for a uniform "bubbling" effect

the technical laminate used is designed to resist standard food-service sanitizers and scale removers common in HVACR and beverage service

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