The GEYA FY-T738 relay module is designed to manage power loads using low-voltage signals, serving as an interface between controllers with open-collector outputs and equipment like pumps or burners. The unit integrates multiple relays with built-in protection and status indication.
The module features optocouplers for galvanic isolation to protect the controller from high-voltage surges. It also includes diodes to suppress parasitic electromotive force and capacitors to filter high-frequency noise generated by inductive loads during startup.
Technical specifications indicate the relay triggers at 16V and releases at 6V, despite a 24V marking. Each relay channel provides both normally open and normally closed contacts, along with LED status indicators. The design allows for component replacement.
The module is intended for use in a boiler room control panel alongside a ZONT 1500 controller. Future plans involve implementing similar modules that support RS-485 communication and the Modbus RTU protocol.
