The Trane SWT1273 is a critical safety component designed for furnace heat exchanger protection and blower control

the contacts should be open

Check for dirty air filters

certifying it as lead-free and safe for above-ground potable water supply systems

This model uses a 3/4 inch NPT (National Pipe Thread) fitting

York S1-024-19082-740 Sequencer Relay Els PW 17895 The Trane SWT1273 is aThe York S1 024 19082 740 Sequencer Relay is a heavy duty, field proven 24V heat sequencer relay designed to manage stage activation in electric furnaces and air handlers. Utilizing a solid state positive temperature coefficient (PTC) heater and bimetallic discs, this control ensures precise, staggered firing of heating elements to prevent high inrush currents and potential circuit breaker trips. It functions by converting a low voltage signal from