8 Channel Relay Module Optocoupler 5V 12V 24V for Arduino

8 Channel Relay Module with Optocoupler — Multi-Voltage Control for Arduino & More

Take full control of your electronics projects with the Asia-Teco 8 Channel Relay Module (Model HY08). Designed for makers, hobbyists, and engineers alike, this versatile relay board lets you switch up to 8 independent loads using a single microcontroller. Compatible with Arduino, Raspberry Pi, 51/AVR/ARM development boards, and more, it's the go-to solution for home automation, robotics, industrial control, and DIY electronics.

Each relay channel features both normally open (NO) and normally closed (NC) contacts, giving you maximum wiring flexibility. The built-in optocoupler isolation keeps your control circuitry safely separated from your load circuitry, protecting your microcontroller and ensuring reliable, noise-free switching.

Key Features

• 8 Independent Relay Channels — control 8 separate devices or circuits simultaneously
• Multi-Voltage Support — compatible with 5V, 12V, and 24V control signals
• High-Current Relay Contacts — rated AC 250V / 10A and DC 30V / 10A per channel
• Optocoupler Isolation — electrically isolates control and load areas for safe, reliable operation
• Active-Low Trigger (IN1–IN8) — easy integration with standard microcontroller GPIO pins
• NO & NC Contacts — 8 normally open and 8 normally closed contacts for flexible wiring
• Blue KF301 Screw Terminals — secure, tool-free wiring for all relay outputs
• Double-Sided FR-4 PCB — professional-grade circuit board for durability and reliability
• LED Status Indicators — individual indicator lights show the active/inactive state of each relay
• 4 Mounting Holes — easy panel or enclosure installation (hole diameter 3.1mm, pitch 131mm × 49.5mm)
• 100% Tested — every unit passes full functional and stability testing before shipping

Technical Specifications

Pin Interface Guide

Control Side:

• VCC — Connect to positive of 5V power supply
• GND — Connect to negative of 5V power supply
• IN1–IN8 — Trigger signal inputs (active low)

Relay Output Side (per channel):

• NO1–NO8 — Normally Open: open before trigger, shorted to COM after trigger
• COM1–COM8 — Common terminal
• NC1–NC8 — Normally Closed: shorted to COM before trigger, open after trigger

Compatible Platforms

Works seamlessly with Arduino Uno/Mega/Nano, Raspberry Pi, ESP8266, ESP32, 51 series MCUs, AVR, and ARM microcontrollers. The standard interface header makes it easy to extend with virtually any development board.

Safety & Standards

This module complies with international safety standards. The load control area and the logic/control area are fully isolated via optocouplers, ensuring your microcontroller is protected even when switching high-power AC or DC loads. For more information on electrical safety standards for electronic components, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Relay

Frequently Asked Questions

Q: What voltages does this 8 channel relay module support?

A: The Asia-Teco HY08 8 channel relay module supports 5V, 12V, and 24V control signals, making it highly versatile for different microcontroller and power supply setups.

Q: Is this relay module compatible with Arduino?

A: Yes! This 8 channel relay module is fully compatible with Arduino (Uno, Mega, Nano), as well as Raspberry Pi, ESP8266, ESP32, AVR, ARM, and 51-series microcontroller boards. The standard GPIO header interface makes wiring straightforward.

Q: What is the maximum load this relay module can switch?

A: Each relay channel can handle up to AC 250V / 10A or DC 30V / 10A, making it suitable for controlling household appliances, motors, lighting, solenoids, and other moderate-power devices.

Q: How does the optocoupler isolation protect my microcontroller?

A: The built-in optocoupler electrically isolates the low-voltage control circuitry (your Arduino or MCU) from the high-voltage load side. This prevents voltage spikes and electrical noise from the load from damaging your microcontroller, ensuring stable and safe operation.

Q: Does this relay module support both normally open and normally closed wiring?

A: Yes. Each of the 8 channels provides a Normally Open (NO), a Common (COM), and a Normally Closed (NC) terminal, giving you the flexibility to wire your circuit in either configuration depending on your application needs.