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WaveShare 8-channel Ethernet relay module in rail-mounted ABS plastic enclosure

WaveShare

WaveShare 8-Ch Ethernet Relay Module (B) 2 in 1 accessory

SKU CH-39VD-D0XG3

Controls eight relays over Ethernet with Modbus and MQTT, optocoupler isolation, 10A contacts and 7–36V or PoE power

  • Automated timing with flash on/off command control
  • Flexible power from 7 to 36 V DC or PoE
  • MQTT protocol support with Alibaba Cloud demo
  • Optocoupler isolation protects against high-voltage interference
  • 10 A 250 VAC 30 VDC contacts in rail-mount ABS case

Industrial Ethernet Relay Module

The WaveShare 8-Ch Ethernet Relay Module (B) is a rail-mountable control unit for industrial automation. It provides eight independently switched relay channels with optocoupler isolation and a wide DC 7–36 V or PoE power input. The module suits engineers building remote switching or monitoring systems that require Modbus RTU, Modbus TCP or MQTT connectivity.

10 A 250 VAC contact rating

Each relay channel is rated for 10 A at 250 VAC or 30 VDC, making the contact rating the key figure for load compatibility. Onboard driver chips with flyback diodes and reverse-polarity protection ensure stable switching, while bi-directional optocouplers isolate digital inputs from high-voltage circuits.

For Modbus and MQTT integrators

This module fits projects that need Ethernet-based relay control with digital-input linkage or toggle modes. It is not suited for applications requiring wireless-only connectivity, higher per-channel current than 10 A, or voltages beyond 250 VAC/30 VDC. Buyers needing more than eight channels or a different fieldbus should consider other form factors.

Highlights

  • Automated timing with flash on/off command control
  • Flexible power from 7 to 36 V DC or PoE
  • MQTT protocol support with Alibaba Cloud demo
  • Optocoupler isolation protects against high-voltage interference
  • 10 A 250 VAC 30 VDC contacts in rail-mount ABS case

Specifications

No published specifications for this item yet.

Questions about this item

What does the 10A contact rating mean for the loads I can switch?

Each relay contact is rated for 10A at 250VAC or 30VDC, so it can handle typical industrial actuators, heaters or lighting circuits within those limits.

How does the Modbus RTU/TCP and MQTT interface limit real-world control speed?

Commands travel over the Ethernet link using Modbus TCP or MQTT, so response time follows your network latency and the protocol overhead rather than a fixed hardware cycle.

What does the rail-mounted ABS enclosure need for installation?

The case clips onto a standard DIN rail and accepts DC 7–36V or PoE power, requiring only a rail slot and a compatible power source.

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