Rheem-Ruud SP10550B Transformer the SWT1277 limit switch is

the SWT1277 limit switch is calibrated to open the circuit at 145°F (cut-out) to halt burner operation and automatically reclose at 115°F (cut-in) once safe parameters are restored

By providing 10 seconds of minimum time-delay at 500% of the rated current

Key Benefits: Instant Fault Interruption: The fast-blow glass fuse response prevents low-voltage surges from damaging expensive furnace control boards

4" WC spec to ensure the combustion air pressure switch is reacting correctly to the inducer motor’s vacuum

Common Questions: What does it mean when my Modine heater flashes three lights

Rheem-Ruud SP10550B Transformer the SWT1277 limit switch isThe Rheem Ruud SP10550B Transformer is a critical industrial grade component engineered for high demand HVACR control circuits. This 40VA 120V to 24V transformer provides the necessary voltage step down to power thermostats, solenoids, and integrated furnace controllers. As a genuine Protech OEM replacement part, it ensures seamless electrical compatibility and mounting alignment for a wide range of Rheem, Ruud, and Vanguard equipment, including