5V 12V Relay Module Optocoupler Isolation – 1 Channel Board

$5.96 $6.71

1-Channel 5V/12V Optocoupler Relay Module – Microcontroller Expansion Board

Take your electronics projects to the next level with this compact 1-channel relay module featuring built-in optocoupler isolation. Compatible with both 5V and 12V trigger voltages, this relay board is ideal for Arduino, Raspberry Pi, ESP8266, ESP32, and other popular microcontrollers. Whether you're building home automation systems, robotics, or DIY electronics prototypes, this module delivers reliable switching performance in a small, easy-to-integrate package.

Made in Mainland China.

Key Features

Optocoupler Isolation: Keeps your microcontroller electrically isolated from the relay load circuit, protecting sensitive components from voltage spikes and noise.
Dual Voltage Compatibility: Supports both 5V and 12V trigger signals, making it versatile across a wide range of microcontroller platforms and power supplies.
Level Trigger Support: Compatible with both high-level and low-level trigger configurations for maximum flexibility in circuit design.
1-Channel Design: Clean, single-relay layout simplifies wiring and is perfect for compact or space-constrained projects.
Standard Relay Output: Provides Normally Open (NO), Normally Closed (NC), and Common (COM) terminals for versatile switching configurations.
Easy Integration: Standard pin spacing and clear onboard labeling make wiring straightforward, even for beginners.
LED Indicator: Onboard LED shows relay status at a glance, simplifying debugging and testing.

Specifications

Number of Channels: 1
Trigger Voltage: 5V / 12V DC
Isolation Type: Optocoupler
Trigger Type: High / Low Level
Relay Output: NO / NC / COM
High-Concern Chemicals: None
Origin: Mainland China

Compatible With

Arduino (Uno, Mega, Nano, etc.)
Raspberry Pi
ESP8266 / ESP32
STM32 and other 3.3V–5V microcontrollers
PLC and industrial control boards

Ideal Applications

Home automation and smart switching
DIY robotics and prototyping
Motor and solenoid control
Lighting control systems
IoT (Internet of Things) projects

Related Products You May Like

Learn more: OSHA on personal protective equipment

Frequently Asked Questions

Q: Is this relay module compatible with a 3.3V microcontroller like the ESP8266 or ESP32?

A: The relay module is designed to trigger at 5V or 12V. While many ESP8266/ESP32 boards output 3.3V logic, you can use a logic-level shifter or connect the module's control signal to a 5V-tolerant pin. The VCC supply should still be 5V or 12V depending on your configuration.

Q: What does optocoupler isolation mean and why does it matter?

A: Optocoupler isolation means the relay's control circuit (your microcontroller side) and the output switching circuit (the load side) are electrically separated using light-based signal transmission. This protects your microcontroller from back-EMF, voltage spikes, or interference generated by the switched load — extending the life of your components and improving circuit safety.

Q: Can this relay module switch AC devices?

A: Yes, the relay output terminals (NO/NC/COM) are typically rated to switch AC loads within the relay's rated current and voltage limits. Always verify the relay's maximum rating on the component datasheet before connecting any mains AC device, and follow proper electrical safety precautions.

Q: What is the difference between high-level and low-level triggering?

A: High-level triggering means the relay activates when the control signal goes HIGH (e.g., 5V). Low-level triggering means the relay activates when the control signal goes LOW (0V/GND). This module supports both configurations, offering greater flexibility when working with different microcontroller output logic.