The Functional Devices RIBH1C SPDT Enclosed Relay is a versatile switching device designed for controlling electrical circuits in HVAC systems. It functions by receiving a control signal that toggles a single-pole, double-throw (SPDT) contact, allowing it to switch between two outputs. Commonly applied in air handlers, heat pumps, unit ventilators, and fan control circuits, it ensures flexible operation and reliable performance. Its enclosed housing enhances safety and protects internal components. The relay simplifies installation, reduces wiring complexity, and improves system efficiency, making it ideal for both commercial and residential HVAC applications.