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Green rectangular circuit board with eight black relay blocks, screw terminals, Ethernet port and USB-C connector

WaveShare

WaveShare Industrial 8-Ch ESP32-S3 WiFi Relay Module RS485 Ethernet

SKU CH-FMNN-2GWAJ

Eight-channel ESP32-S3 relay module with Wi-Fi, Bluetooth LE, RS485 and Ethernet, 10 A 250 V AC contacts and isolated digital inputs

  • 8 channels switch 10 A at 250 V AC or 30 V DC
  • ESP32-S3 dual-core 240 MHz with 2.4 GHz Wi-Fi and Bluetooth LE
  • Isolated RS485 and 10/100 Ethernet via W5500 for industrial networking
  • 7–36 V wide input with power, optocoupler and digital isolation
  • Arduino IDE support plus USB Type-C for power, firmware and debug

Industrial 8-Channel ESP32-S3 Relay Module

This module is an industrial-grade relay controller built around the ESP32-S3 microcontroller with a 32-bit LX7 dual-core processor running at 240 MHz. It provides eight independent relay channels for switching AC or DC loads in automation systems. Integrated 2.4 GHz Wi-Fi and Bluetooth LE enable wireless configuration and remote operation. The board targets engineers and system integrators building reliable industrial control panels.

Upgrade from basic relay boards without isolation

Unlike simple relay shields, this unit includes comprehensive isolation protection with power, optocoupler, and digital signal isolation circuits. The onboard RS485 interface and W5500 Ethernet chip add wired industrial connectivity that basic Wi-Fi-only boards lack. The jump is worth it when a project demands Modbus RTU over RS485, stable 10/100 Mbps Ethernet, or safe interfacing with high-voltage circuits. Legacy modules without these interfaces cannot integrate into modern industrial networks.

Handles 10A 250V AC and 30V DC loads with wide

Each relay channel switches up to 10A at 250V AC or 30V DC, suitable for directly controlling 220V AC appliances or lower-voltage DC equipment. The power supply accepts 7 to 36V input for flexible industrial deployment. Eight digital inputs support both passive dry contacts and active wet contacts with bi-directional optocoupler isolation. Headroom ends at the eight-channel limit and the 100 Mbps Ethernet ceiling; larger installations require additional modules.

Highlights

  • 8 channels switch 10 A at 250 V AC or 30 V DC
  • ESP32-S3 dual-core 240 MHz with 2.4 GHz Wi-Fi and Bluetooth LE
  • Isolated RS485 and 10/100 Ethernet via W5500 for industrial networking
  • 7–36 V wide input with power, optocoupler and digital isolation
  • Arduino IDE support plus USB Type-C for power, firmware and debug

Specifications

No published specifications for this item yet.

Questions about this item

What screw-terminal voltage range does the module accept for power input?

The onboard power terminal accepts a wide 7 to 36 V DC supply, making it suitable for industrial power environments.

How do you flash firmware onto the ESP32-S3, and what mistake do users make?

Connect the USB Type-C port to a computer and use the Arduino IDE or ESP-IDF; the common error is forgetting to hold the BOOT button while pressing EN to enter download mode.

What relay-contact rating determines when the onboard relays must be replaced?

Each relay is rated for 10 A at 250 V AC or 30 V DC; replace a channel when its contacts no longer switch cleanly within those limits.

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