Functional Devices TR40VA004 Transformer and 243-SR models where a

and 243-SR models where a robust 1-piece clamp is required for the upper housing assembly

though values vary based on the specific control board's voltage output

ensuring a precision fit on standard D-shaft or slotted thermostat stems without the need for additional adapters

To ensure maximum job-site versatility

double throw (SPDT) snap switch and internal sensitivity adjustments from dust

Functional Devices TR40VA004 Transformer and 243-SR models where aThe Functional Devices TR40VA004 is a versatile 40VA multi tap power transformer engineered for reliable 24Vac secondary output in demanding HVACR and building automation environments. Designed for maximum flexibility, this unit handles primary voltages of 120V, 208V, 240V, and 277V, making it a standard truck stock item for commercial and residential service calls. The TR40VA004 features inherently limited over current protection, ensuring the safety