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.

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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)

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Package Includes

• 1x EMR 8-Channel Relay Board

• Shipped in sturdy protective cardboard box (190mm x 100mm x 30mm)

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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

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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

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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.

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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