This single-pole single-throw (SPST) vacuum switch is factory-set to trip at -

Matches proprietary Carrier technical specifications for reliable signal transmission

incremental control of heating loads

Connect your 24V power source to the designated input terminals

It requires a specific control signal from an ECM-compatible control board and cannot be wired as a direct replacement for standard induction motors

Resideo RRD5 Damper 321142-301 This single-pole single-throw (SPST) vacuumThe Resideo RRD5 is a high performance 5 inch retrofit round damper designed for professional contractors a looking to integrate reliable zoning into existing rigid ductwork. This HVAC bypass damper features a 24Vac 3 wire floating actuator that provides power open power closed functionality, ensuring the blade stays exactly where the TrueZONE panel or control system commands it. With an actuator torque of 35 in lb and a 90 second timing cycle, the