The General Electric RR9PBP 5-Pin Pilot Light Relay is a mechanical latching relay designed to control line-voltage circuits using momentary low-voltage signals. It operates with 24V control pulses to switch connected loads while remaining latched until the next command. The relay is primarily used in GE lighting automation and building control systems, rather than HVAC equipment, and... https://www.partshnc.com/rr9pbp-general-electric-products-pilot-light-relay-5-pin