4-Channel 5V Relay Module

4‑Channel 5 V Relay Module – Actuators

The 4‑Channel 5 V Relay Module is a compact, breadboard‑friendly board that lets you control up to four separate high‑voltage or high‑current devices (lights, motors, solenoids, HVAC components, etc.) directly from a 5 V microcontroller such as an Arduino, Raspberry Pi, or ESP32. Each channel contains an optically isolated relay, a transistor driver, and a protective diode, so the low‑voltage logic side stays completely safe from the load side. The module’s screw terminals and clearly labeled pins make wiring straightforward, while the onboard LED indicators give instant visual feedback on which relays are active.

Using this module, students will learn how to bridge the gap between digital code and real‑world power electronics by writing sketch code to switch devices on and off, sequencing multiple loads, and implementing safety practices such as isolation and flyback protection. Key features include 4 independent 5 V‑triggered relays (10 A @ 250 V AC / 10 A @ 30 V DC), optocoupler isolation, LED status indicators, compact 30 mm × 20 mm footprint, and compatible pin headers for quick prototyping. Because it integrates coding, circuitry, and mechanical actuation, the relay module is an ideal STEAM tool for projects ranging from automated greenhouse vents to robot grippers, giving learners hands‑on experience in electronics, programming, and system design while reinforcing concepts of safety, energy control, and interdisciplinary problem‑solving.