Short Description
A professional-grade 8-channel electromagnetic relay board, built around the XL9535 I2C expander chip. Designed for high reliability, clean layout, and ease of integration with external microcontrollers like Arduino and ESP32. Perfect for industrial and home automation applications.

Key Features

8 I2C-Controlled Channels using XL9535 GPIO expander
Compatible with external MCUs (Arduino, ESP32, Raspberry Pi)
Dual Power Support:
• 3.3V for logic (IC side)
• 5V for relays
Compact Size: PCB board dimension 72mm x 150mm
Vertical USB-C Port for DIN rail enclosures
Clearly Marked I2C Address Jumpers (DIP switch)

Package Includes

1x EMR 8-Channel Relay Board
Shipped in sturdy protective cardboard box (190mm x 100mm x 30mm)

Use Cases & Compatibility

Home Automation (Home Assistant / ESPHome)
Industrial Automation
IoT Projects
AC/DC Load Switching

Compatible with:

Arduino (5V logic)
ESP32 (3.3V logic)
Raspberry Pi
Any microcontroller with I2C interface

Technical Specifications

Relay Type: Electromagnetic SPDT (Single Pole Double Throw)
Contact Ratings:

10A @ 250V AC
10A @ 125V AC
10A @ 30V DC
10A @ 28V DC

Coil Specs:

Rated Coil Voltage: 5V DC
Coil Resistance: ~70Ω (±10%)
Trigger Current: ~70mA
Operate Time: ≤10ms
Release Time: ≤5ms

Electrical Life: 100,000 operations
Mechanical Life: 10 million operations
Operating Temperature: -40°C to +85°C
Dielectric Strength: High isolation between control and load sides

Power Configuration Guide

For 5V Logic MCU (e.g., Arduino UNO):
Use a single 5V power source for both the XL9535 IC and the relays.

For 3.3V Logic MCU (e.g., ESP32, Raspberry Pi):
Use Dual Power Mode:

3.3V to power the XL9535 IC
5V to power the relays

Dual Power Mode improves system stability by isolating relay power from MCU power, reducing noise and ensuring reliable I2C communication.

Why Choose This Module?

Professionally designed and manually soldered for maximum reliability
Built for seamless integration into smart systems
Designed with installation & long-term maintenance in mind
Ready for DIN rail enclosure builds
Dual Power Mode improves system stability

Source Code for Arduino , Raspberry PI :

https://github.com/iotmug/8-Channel-Dual-EMR-I2C-TypeC

Country of Origin	China
Brand	IOTMUG
Current Type	AC/DC
Type	Relay Board

8 Channel I2C Electromagnetic Relay Module Arduino Raspberry Dual Power TYPE C

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