It features a robust snap-action switch system with an adjustable differential

Calibrated for natural gas systems with a standard 3

preventing the heat exchanger from "soaking" in high temperatures

allowing it to adapt to various control logic requirements

Trane TRR1581 Transformer 321894-706 It features a robust snap-actionThe Trane TRR1581 Transformer is a heavy duty 75VA HVAC replacement part engineered for demanding residential and commercial applications. Designed to step down 200 230V primary voltage to a stable 24V secondary output, this component ensures consistent low voltage power for critical systems including furnace control boards, 24V thermostats, and contactor coils. As a genuine Trane OEM transformer, it eliminates the guesswork of universal fitments,