The Marantec 88573 Relay Board Kit is a genuine OEM accessory designed to add an auxiliary relay output to select Marantec garage door openers. This relay interface enables integration with external devices that need a dry-contact trigger, such as warning buzzers, lights, automation systems, or compatible third-party controls. It is ideal as a replacement part for a failed relay board or as an upgrade to expand the output capabilities of a compatible Marantec operator used in residential or light commercial applications.
Installation typically involves opening the operator housing and connecting the relay board to the designated internal port on the opener’s control board; wiring of external devices should follow the specific model’s wiring diagram and safety procedures. Always disconnect power before service, and verify compatibility with your opener’s manual or the manufacturer to ensure the 88573 kit matches your model and firmware. Because wiring and function assignments can vary by opener, any configuration or programming steps should be performed exactly as outlined by Marantec’s technical documentation.