ESC3B04 DIN rail-compatible industrial relay board features 4 outputs, 4 analog/digital inputs, RS-485 interface

The ESC3B04 is a compact DIN rail-compatible relay board built around the ESP32-C3 Super Mini module for building Wi-Fi remote switches, voltage monitoring systems, motor control, timed automation, and RS-485-based setups.

The board features four 10A relay outputs, four 0–5V/10V analog voltage inputs (also configurable as 12–24V PNP digital inputs), an RS-485 interface, and a push-button input. It operates on a 7–25V DC supply and supports direct installation in control panels or DIN-rail enclosures.


ESC3B04 relay board specifications:

  • Wireless module –16-pin ESP32-C3 Super Mini module
    • SoC – Espressif Systems ESP32-C3FH4, single-core 32-bit RISC-V microcontroller @ up to 160 MHz; 400 KB SRAM; 4MB flash
    • USB – 1x USB Type-C port for programming
    • Ceramic antenna
  • I/Os and expansion
    • 4x relays (10A/240VAC)
    • 4x 0-5V/0-10V analog voltage inputs (can be used as 12-24V digital inputs)
  • Serial – RS-485 interface for Modbus or custom protocol communication
  • Misc
    • User button
    • Power LED
  • Power Supply
    • 7-25V DC wide range supply voltage via terminal block
    • Current consumption
      • Standby – 15mA
      • 1 relay ON – 74mA
      • 2 relays ON – 106mA
      • 3 relays ON – 131mA
      • 4 relays ON – 164mA
  • Dimensions – 77 x 72 x 19 mm (board only)
  • Weight –  80 grams (board only), 144 grams with DIN enclosure

 

ESC3B04 Relay Board Hardware Overview
ESC3B04 relay board hardware overview
ESC3B04 Wiring Diagram
ESC3B04 wiring diagram

 

The company mentions that the ESP32-C3 board can be programmed with the Arduino IDE, ESP-IDF framework, or PlatformIO. No code is provided, so the users have to program RS-485, Wi-Fi control, and automation logic by themselves.

Previously, we have written about other Espressif-based relay boards like the XIAO 6-Channel Wi-Fi 5V DC Relay Board, the ESP32 IoT Relay Board” credit card-sized quad relay board compatible with Tasmota, and the Olimex ESP32-C6-EVB, out of which the Olimex board is most feature-rich and integrates Wi-Fi 6, BLE 5.0, and Zigbee/Thread via the ESP32-C6, and includes 4 opto-isolated digital inputs, 4 relays, USB-C for programming, and more.

The ESC3B04 industrial relay board is available with the ESP32-C3 Super Mini module on AliExpress for $12.27 or $12.84 with the DIN rail mount. More information about the product can be found on Eletechsup’s product page.

 

ESC3B04 Board Dimensions
ESC3B04 board dimensions
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