We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green circuit board with four black relay cubes and pin headers

SMUGDESK

SMUGDESK 5V 4-Channel Relay Module Optocoupler Isolation 51

SKU CH-W53S-AXY2X

A 5V four-channel relay board with optocoupler isolation and LED status indicators for microcontroller automation projects

  • Four independent relay channels for multi-circuit switching control
  • Built-in optocoupler isolation separates control and load circuits for stability
  • DC 5V operating voltage compatible with AVR, 51, PIC microcontrollers
  • Dedicated LED indicator per channel shows relay activation status
  • Compact breakout board with pre-soldered headers for easy DIY wiring

5V 4-Channel Relay Module

This module provides four independent relay channels with optocoupler isolation for microcontroller projects. It allows a low-voltage MCU signal to switch higher-voltage or higher-current loads safely. The board is designed for automation control and DIY development work. Standard pin headers are pre-soldered for quick wiring.

Optocoupler Isolation Upgrade

The built-in optocoupler isolates the control circuit from the load circuit to protect the main control chip from interference. This replaces direct-drive setups where load transients can damage sensitive logic. The jump is worth it when switching inductive loads or when system stability is critical. Each channel includes an LED indicator for immediate status confirmation.

Compatibility Check

Verify that your microcontroller operates at 5V logic levels for direct connection. Confirm the load voltage and current stay within the relay contact ratings for your application. Ensure you have a suitable 5V power supply capable of driving all four relay coils simultaneously. Check that normally open or normally closed contacts match your control logic.

Highlights

  • Four independent relay channels for multi-circuit switching control
  • Built-in optocoupler isolation separates control and load circuits for stability
  • DC 5V operating voltage compatible with AVR, 51, PIC microcontrollers
  • Dedicated LED indicator per channel shows relay activation status
  • Compact breakout board with pre-soldered headers for easy DIY wiring

Specifications

No published specifications for this item yet.

Questions about this item

What pin headers are pre-soldered on the SMUGDESK 5V 4-Channel Relay Module for wiring?

Standard pin headers are pre-soldered on the module for convenient wiring and prototype testing with microcontroller projects.

How do you connect the control signals to the relay module, and what common wiring mistake should be avoided?

Connect the DC 5V control signals to the pre-soldered pin headers matching your microcontroller pins; a common mistake is reversing the VCC and GND connections which prevents operation.

What components on the relay module may require replacement after extended switching cycles?

The four mechanical relay switches are the primary components that may need replacement after extensive switching cycles due to contact wear over time.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.