Features 1、Power over Ethernet Support: This Ethernet relay module supports PoE for power supply, with an ABS rail mounted housing design. It boasts fast, stable, and secure communicating, making it suitable for various industrial control devices or applications with high communicating requirements. 2、Versatile Protocol Support: Control relays via MQTT protocol, for Modbus RTU protocol, for Modbus TCP protocol. Featuring onboard optocoupler isolation to prevent relay high voltage circuit interference. 3、Specialized Relay Driver Chip: The Ethernet relay board utilizes a dedicated relay driver chip with built in freewheeling diode guard for enhanced and stable driving capability. 4、LED Indicators: Equipped with 4 external LED indicators and network port indicator lights for easy monitoring of MCU status and signal transmission and reception status. 5、Flash On/Off Functionality: Offers flash on and flash off functions, allowing relay operating with parameter inclusive commands to automatically close after a set period of time. Specification Item Type: Ethernet Relay Module Material: ABS Power Supply: PoE Port, DC 5.5x2.1 Power Interface or Terminal Block (7 to 36V) Communicating Interface: PoE Port, supports IEEE 802.3af standard Relay Channels: 30 Channels Contacting Type: 1 Normally Open, 1 Normally Closed Contacting Load: ≤10A AC or ≤10A 30V DC for Modbus Protocol: for Modbus RTU Protocol or for Modbus TCP Protocol Package List 1 x Ethernet Relay Module