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4-channel optocoupler relay

4-channel optocoupler relay

4-channel optocoupler relay - MADIBA BAY OPTICS

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A 4-channel relay module with optocoupler allows low-power microcontroller signals to safely control high-voltage devices with electrical isolation.

Overview

A 4-channel relay module with optocoupler is an electronic board designed to let low-current control signals from devices like Arduino, Raspberry Pi, ESP32, or PLCs switch higher-power AC or DC loads safely. The optocouplers provide electrical isolation between the control side and the high-voltage load side, protecting the microcontroller from voltage spikes or surges .

Key Features

  • Four Independent Relays: Each relay has a coil, a Common (COM) terminal, Normally Open (NO), and Normally Closed (NC) terminals, allowing flexible switching configurations .
  • Optocoupler Isolation: Uses light to transmit signals between the control and load circuits, ensuring no direct electrical connection and enhancing safety .
  • Voltage and Current Ratings: Commonly supports 5V control signals and can switch loads up to 10A at 250V AC or 30V DC .
  • LED Indicators: Each relay has an LED to show its operational status, making monitoring easier .
  • Trigger Modes: Supports high-level (PNP) or low-level (NPN) signal triggering, configurable via jumpers on the module .
  • Compact and Durable: Small form factor for easy integration into DIY projects, home automation, or industrial control setups .

Applications

  • Home Automation: Control lights, fans, or appliances remotely.
  • Industrial Control: Switch motors, pumps, or other high-power devices.
  • DIY Electronics Projects: Integrate with microcontrollers for robotics, IoT, or sensor-based systems.
  • Safety-Critical Systems: Electrical isolation prevents damage to sensitive control electronics.

Integration Tips

  • Connect the VCC and GND to the module's power supply.
  • Use SIG+ and SIG- for signal input, matching the trigger type (high or low level).
  • Ensure the load does not exceed the relay's rated voltage and current.
  • Use screw terminals for secure connections and reliable operation . This module is ideal for anyone needing to control multiple high-voltage devices safely and efficiently while maintaining isolation from the control electronics.

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