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WaveShare 8-channel Ethernet relay module in rail-mounted ABS case with LEDs

WaveShare

WaveShare 8-Ch Ethernet Relay Module 2 in 1 accessory

SKU CH-JWJ1-7RAEX

Controls eight relays via Ethernet using Modbus and MQTT, supports 7–36 V DC or PoE power, and provides optocoupler isolation with 10 A 250 VAC contacts in a rail-mount case

  • Timed relay switching with flash-on and flash-off function
  • Power from DC 7~36 V supply or PoE port
  • MQTT protocol control with Alibaba Cloud demo included
  • Optocoupler isolation protects against high-voltage interference
  • 10 A 250 VAC 30 VDC contact rating on each relay

Eight-Channel Ethernet Relay Module

The WaveShare 8-Ch Ethernet Relay Module provides eight independently controllable relay channels for industrial automation and remote switching tasks. It communicates over Modbus RTU or Modbus TCP and supports MQTT control with an Alibaba Cloud demo. Power can be supplied through a DC 7 to 36 V input or via Power over Ethernet.

Sustained Operation with Isolation and Protection

Onboard optocoupler isolation shields the control circuitry from high-voltage transients on the relay contacts. A reverse-proof circuit prevents damage from accidental polarity reversal. Each relay is rated for 10 A at 250 VAC or 30 VDC, allowing continuous switching of substantial loads. Status LEDs and network indicators give immediate visual feedback on MCU and communication health.

Upgrade from Simple USB or Serial Relays

This module replaces basic USB or single-port serial relay boards when Ethernet connectivity, PoE convenience, or multi-protocol support are required. The rail-mounted ABS case suits cabinet installations where loose boards are impractical. The jump is worthwhile when remote network management, flash timing functions, or mixed Modbus and MQTT environments are needed.

Highlights

  • Timed relay switching with flash-on and flash-off function
  • Power from DC 7~36 V supply or PoE port
  • MQTT protocol control with Alibaba Cloud demo included
  • Optocoupler isolation protects against high-voltage interference
  • 10 A 250 VAC 30 VDC contact rating on each relay

Specifications

No published specifications for this item yet.

Questions about this item

Does the 8-channel relay module generate noticeable heat when powered continuously via PoE?

The unit draws power through PoE or a 7–36 V DC source and uses optocoupler isolation to keep high-voltage switching separate from the control logic, limiting heat buildup during long runs.

What power source must I already have to run the module without PoE?

A DC supply between 7 V and 36 V is required; the onboard reverse-proof circuit protects against accidental polarity mistakes.

Will the 10 A 250 VAC contacts switch loads from my existing 30 VDC control gear?

Yes, each relay is rated for 10 A at 250 VAC or 30 VDC, so it can directly drive the same low-voltage devices you currently use.

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