1 Channel Relay Module Optocoupler Isolation 5V 12V Trigger

Upgrade your electronics projects with the 1 Channel Relay Module with Optocoupler Isolation — a compact, reliable relay board designed for seamless integration with microcontrollers, automation systems, and DIY electronics builds. Available in 5V and 12V versions, this module delivers clean signal switching with built-in optocoupler isolation to protect your control circuitry.

Key Features

• Optocoupler Isolation: Built-in optocoupler separates the control circuit from the load circuit, protecting your microcontroller or logic board from voltage spikes and interference.
• 5V & 12V Compatible: Choose the version that matches your project's power supply — the GND and VCC pin headers correspond to the negative and positive terminals of your chosen supply voltage.
• High-Level Trigger: The relay activates when the control port receives a high-level signal, making integration with Arduino, Raspberry Pi, and other microcontrollers straightforward.
• Compact Form Factor: Measures approximately 4.2 × 1.7 × 1.9 cm (1.65 × 0.67 × 0.75 in) — small enough to fit into tight enclosures without sacrificing functionality.
• Single-Channel Design: Controls one independent relay output — ideal for switching lights, motors, solenoids, or other electrical loads.
• Easy Plug-and-Play Setup: Pin headers are clearly labeled for quick wiring. No soldering required for standard connections.
• Durable Construction: Built with quality components for consistent, repeatable switching performance in automation and control applications.

Specifications

• Channels: 1
• Operating Voltage: 5V or 12V (select your version)
• Trigger Type: High-level trigger
• Isolation: Optocoupler (signal/load circuit separation)
• Dimensions: ~4.2 × 1.7 × 1.9 cm / 1.65 × 0.67 × 0.75 in
• Compatible With: Arduino, Raspberry Pi, and most 5V/12V microcontroller platforms

Perfect For

• Home automation and smart device projects
• Arduino and Raspberry Pi control circuits
• Industrial control and regulation systems
• DIY electronics, robotics, and maker projects
• Switching AC/DC loads safely from low-voltage logic signals

For guidance on electrical safety when working with relay modules and switching circuits, refer to resources from the U.S. Occupational Safety and Health Administration (OSHA) — Electrical Safety.

Frequently Asked Questions

Q: What does the optocoupler isolation do in this relay module?

A: The optocoupler isolation electrically separates your control circuit (e.g., a microcontroller like Arduino) from the relay's load-switching circuit. This prevents high-voltage spikes or back-EMF from the switched load from damaging your logic board, making the 1 Channel Relay Module with Optocoupler Isolation much safer for use in mixed-voltage projects.

Q: What is the difference between the 5V and 12V versions of this relay module?

A: The difference is in the coil operating voltage. The 5V version requires a 5V power supply connected to the GND and VCC pin headers, while the 12V version requires a 12V supply. Both versions feature the same high-level trigger logic and optocoupler isolation — choose based on the power supply available in your project.

Q: Is this relay module compatible with Arduino and Raspberry Pi?

A: Yes. The 1 Channel Relay Module is compatible with Arduino, Raspberry Pi, and most standard microcontroller development boards. The high-level trigger design means the relay activates when the control pin receives a HIGH signal from your microcontroller's GPIO output, making wiring and programming straightforward.

Q: What types of loads can I switch with this relay module?

A: This relay module is suitable for switching a wide range of electrical loads, including lights, fans, motors, solenoids, and other AC or DC devices — within the relay's rated specifications. Always ensure the load current and voltage do not exceed the relay's rated capacity for safe and reliable operation.