This 5V / 12V / 24V (you can select the coil voltage) 4 channel relay module allows 5V / 12V / 24V systems to safely switch high voltage or high current loads using optical isolation.
The onboard SMD optocoupler electrically separates the control circuit from the relay switching circuit, helping protect your circuitry from voltage spikes, electrical noise, and back EMF generated by inductive loads.
This version supports both high level and low level triggering via an onboard jumper.
Electrical Specifications
- Operating Voltage: 5V /12V /24V DC
- Trigger Current: 5mA
- Maximum Switching Load AC: 250V 10A
- Maximum Switching Load DC: 30V 10A
- Relay Outputs: NO Normally Open, NC Normally Closed, COM Common
- Module Dimensions: 50mm × 73mm × 18.5mm
Pin Configuration
- DC+ Positive power supply VCC
- DC- Negative power supply GND
- IN Control signal input high or low level selectable
- NO Normally Open relay interface
- COM Common relay interface
- NC Normally Closed relay interface
- H / L Jumper pins that switch between High and Low level trigger
Key Features
- High / Low Level Switching: Selectable high or low level trigger via onboard jumper for flexible control compatibility
- SMD optocoupler isolation: Improved protection by isolating control from switching circuit, reducing interference, and stabilising performance. Optical isolation ensures safe operation when controlling high voltage or current loads.
- Fault tolerant design: Prevents unintended relay activation if the control signal line is disconnected
- Integrated LEDs: Green power indicator LED and red relay status LED for clear visual feedback
- Screw terminals: Clearly labelled screw terminals for secure and convenient wiring connections
Typical Applications
Perfect for 5V / 12V / 24V home automation systems, car electronics, solar projects, security systems, lighting, pumps, motors, and other AC or DC loads.
This 5V / 12V / 24V 4 channel optocoupler relay module is designed for reliable control in 12V environments where electrical isolation and stable performance are required.