5V Relay Module with Optocoupler – 1/2/4/8 Channel Options

These 5V relay modules with optocoupler give you reliable control for Arduino and other microcontrollers. The flexible channel options let you build exactly the setup you need.

Built for makers and professionals, each module delivers stable switching performance.

5V Relay Module – Benefits for You

✅ Safely isolate your control signals from high‑voltage loads, so your microcontroller stays protected.

✅ Enjoy smooth, stable switching thanks to the onboard optocoupler, which reduces electrical interference.

✅ Control AC or DC devices with confidence, giving you more flexibility in automation projects.

✅ Use clear status indicators so you instantly know when each relay is active.

✅ Mount the module easily with integrated screw holes, so installation is fast and secure.

✅ Work with a wide range of systems, allowing simple integration with Arduino, PLCs, and industrial controllers.

✅ Connect wiring quickly through organized terminals, helping you build clean and dependable circuits.

Optional CTA: Enhance your automation projects with dependable relay switching that keeps your components safe.

These relay boards support various loads, including up to AC 250V/10A and DC 30V/10A on the mechanical relay models. Whether you choose the 1‑channel, 2‑channel, 4‑channel, or 8‑channel version, each module delivers consistent performance for home projects, DIY electronics, or professional setups.

The single‑channel module offers a compact design with mounting holes and clearly marked VCC, GND, and input terminals for quick setup. It works seamlessly with low‑current trigger signals, making it ideal for simple on/off control tasks.

The dual‑channel version adds extra flexibility. Its sturdy PCB, high‑quality relay components, and dual‑sided board design ensure reliability when controlling two separate loads. With optocoupler isolation and easy jumper configuration, it provides stable operation even in environments with electrical noise.

The four‑channel module is suitable for more advanced automation or multi‑device control. It supports independent inputs, allowing each relay to be activated individually. This makes it perfect for multi‑zone lighting, robotics, small machinery, or smart home applications.

The eight‑channel model is designed for larger control systems. It features well‑spaced screw terminals, individual indicators, and durable components that withstand repeated switching. Its layout helps maintain neat wiring and supports platforms such as Arduino, ARM, AVR, and PLC systems.

The solid‑state relay versions bring fast, silent, and long‑lasting switching. Using Omron components, they offer 240V 2A output capability and provide both pin headers and KF301 terminals for convenient wiring. These boards are ideal when you want contactless switching with minimal mechanical wear.

Each module supports correct high‑level or low‑level triggering depending on the version, letting you match the board to your controller’s output logic. This makes integration with different microcontrollers simple and predictable.

Setup is straightforward: connect DC power to the module, wire your load to the relay terminals, and send a trigger signal. Once the input reaches the activation threshold, the relay switches your device on, making it easy to control lights, motors, valves, or other equipment.

Precautions include using the correct DC supply voltage and ensuring that solid‑state models are used with AC loads only. Mechanical relay versions support both AC and DC loads, offering more versatility for mixed‑system environments.

These visuals highlight the sturdy build and organized connection layout, helping you understand the board before installation.

Clear indicators and optocoupler placement help ensure smooth operation in complex wiring environments.

The terminals are arranged for convenient access, making wiring simpler during installation.

Durable PCB design helps maintain long-term performance even with frequent switching cycles.

Solid‑state variants offer quiet, fast switching, ideal for applications requiring minimal noise and extended life.

Take control of your automation projects with a dependable 5V relay module that delivers safety, power, and flexibility.