Ethernet Relay Module for Modbus RTU TCP Protocol 30 Channel PoE Port Relay Controller Board with Various Isolation and Protective Circuits 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