Waveshare Modbus Relay Series, 8-ch, 16-ch, 32-ch, Multi Isolation Protection Circuits, RTU Protocol
It features embedded protection circuits such as power isolation, magnetical isolation, and TVS diode, etc. It also comes with an ABS enclosure. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipments and/or applications with high communication requirement.