1 / 2 / 4 / 8 Channel Relay Module – 5V / 12V / 24V Optocoupler Isolated High & Low Level Trigger
$2.25 – $7.50Price range: $2.25 through $7.50
Control high-voltage and high-current devices safely with this relay module board, available in 1, 2, 4, and 8 channel versions with 5V, 12V, or 24V relay coil options. Designed for microcontroller, automation, and industrial control projects, these modules support both high-level and low-level triggering with built-in optocoupler isolation.
Ideal for Arduino, ESP32, Raspberry Pi, PLC, and DIY automation systems, these relay boards allow low-voltage control signals to safely switch higher-voltage loads such as lights, pumps, motors, fans, and appliances.
Key Features
- Available in 1 / 2 / 4 / 8 channel configurations
- Models available in 5V, 12V, and 24V
- Optocoupler isolation for improved protection and reduced interference
- Supports high-level and low-level trigger modes
- Compatible with Arduino, ESP32, Raspberry Pi, STM32, PLC, and other microcontrollers
- LED indicators for relay status and power
- Screw terminal outputs for easy wiring
- Durable PCB design with mounting holes
How It Works
The relay module uses low-voltage control signals to switch higher-voltage circuits safely. When a trigger signal is received, the onboard relay activates and connects or disconnects the external load through the relay terminals.
Trigger Modes
- High-level trigger – Relay activates when the input signal is HIGH
- Low-level trigger – Relay activates when the input signal is LOW
Specifications
| Channel options | 1 / 2 / 4 / 8 channel |
| Module voltage options | 5V / 12V / 24V DC |
| Trigger type | High-level / Low-level |
| Isolation | Optocoupler isolated |
| Relay type | Electromechanical relay |
| Control compatibility | Arduino, ESP32, Raspberry Pi, PLC, MCU |
Technical Parameters
5V Relay Module
| Relay voltage | 5V DC |
| Quiescent current | 5mA |
| Maximum current | 190mA |
| Trigger current | 2–4mA |
| Low-level trigger voltage | 0–1.5V |
| High-level trigger voltage | 2.5–5V |
12V Relay Module
| Relay voltage | 12V DC |
| Quiescent current | 5mA |
| Maximum current | 80mA |
| Trigger current | 2–4mA |
| Low-level trigger voltage | 0–4V |
| High-level trigger voltage | 4.5–12V |
24V Relay Module
| Relay voltage | 24V DC |
| Quiescent current | 5mA |
| Maximum current | 50mA |
| Trigger current | 2–4mA |
| Low-level trigger voltage | 0–8V |
| High-level trigger voltage | 8.5–24V |
Common Applications
- Home automation systems
- Smart switches and IoT projects
- Lighting, fan, and pump control
- Motor and appliance switching
- Industrial automation and robotics
Important Notes
- Select the correct 5V, 12V, or 24V module for your system voltage
- Do not apply incorrect supply voltage to the relay module
- Ensure connected loads stay within relay voltage and current ratings
- Take proper safety precautions when switching mains electricity
Tip: Optocoupler isolation helps reduce electrical noise and improves reliability when controlling motors, pumps, and other inductive loads.
| Weight | N/A |
|---|---|
| Dimensions | N/A |
| Channels | 1 channel, 2 channels, 4 channels, 8 channels |
| Module Voltage | 5V, 12V, 24V |
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