BDD 4-Channel Relay Board 3.3V for Raspberry Pi ESP32 Arduino

The 4-Channel 3.3V Relay Module is designed for reliable switching of AC and DC loads using low-voltage microcontrollers such as the Raspberry Pi, ESP32, Arduino, and other 3.3V logic devices. Featuring optocoupler isolation, selectable high or low-level triggering for each relay, and 10A switching capability, it provides safe, stable, and flexible control for automation and electronics projects.

Each relay can be configured independently using onboard jumpers, allowing compatibility with a wide range of control logic. LED status indicators provide instant visual feedback, while screw terminal connections make installation quick and secure.

Features:

• 4 independent relay channels
• Operates from a 3.3V DC supply
• Compatible with Raspberry Pi, ESP32, Arduino and other 3.3V controllers
• Selectable high or low-level trigger for each relay
• Optocoupler isolation for improved electrical safety and noise immunity
• Supports switching AC and DC loads up to 10A
• Low trigger current of approximately 5mA
• Green power LED and red relay status LEDs
• Screw terminal connections for easy wiring
• Fault-tolerant design prevents accidental relay activation if the control signal is disconnected

Specifications:

• Operating Voltage: 3.3V DC
• Relay Channels: 4
• Maximum AC Load: 250V AC, 10A
• Maximum DC Load: 30V DC, 10A
• Trigger Current: Approximately 5mA
• Trigger Mode: Selectable High-Level or Low-Level (per channel)
• Isolation: Optocoupler
• Indicators: 1 × Power LED, 4 × Relay Status LEDs
• Dimensions: 73 × 50 × 18.5mm
• Mounting Hole Diameter: 3.1mm
• Mounting Hole Spacing: 67 × 44.5mm

Applications:

• Home automation
• Smart IoT projects
• Industrial equipment control
• Lighting and appliance switching
• Security and access control systems
• Robotics and embedded systems
• Signal switching and protection circuits

What's in the box
1 x 4-Channel 3.3V Relay Module with Optocoupler