4 Channel 5V Relay Module With Optocoupler For Arduino UNO R3 Mega 2560 DSP ARM PIC AVR STM32 Projects Active Low 10A At 250VAC And 10A At 30VDC Contacts Direct Microcontroller Interface Status LEDs DIY Friendly Safe Operation

Four-Channel 5V Relay Module with Optocouplers for MCUs
✔️ 4-channel 5V active-low module with optocouplers, pack of 1

The 4-channel 5V relay board is designed to be driven directly from microcontrollers such as Arduino, STM32, PIC, AVR, and PLC systems. It lets you safely switch high voltage AC loads and low voltage DC devices from your MCU with built-in optocouplers for isolation. Perfect for DIY projects, home automation, and industrial control experiments.

✅ 4-channel relay interface board for direct MCU control
✅ 10A at AC250V and 10A at DC30V contact rating
✅ 5V operation with optocoupler isolation and LED status indicators
✅ Suitable for Arduino, AVR, PIC, ARM, STM32, PLC and DIY projects

💡 What is a common use case for this 4 channel 5V relay module with optocouplers?

It’s handy for bridging microcontrollers to mains or low voltage devices with isolation.

- Interfacing a microcontroller to mains devices - Controlling lights, fans, and pumps in home automation and workshops - PLC or automation system testing with safe isolation - DIY robotics power switching and safety testing