Solid State Relay Module 2-Channel 5V DC
The 2-Channel Solid State Relay (SSR) Module 5V DC is a reliable, compact, and efficient switching solution that allows microcontrollers and low-power devices to safely control AC loads. Unlike traditional electromechanical relays, this SSR module uses semiconductor-based switching technology, offering silent operation, faster response, and extended durability since there are no mechanical contacts.
With two independent channels, this module can control two separate AC loads simultaneously, making it ideal for home automation, IoT applications, robotics, and industrial automation systems. It provides a safe interface between low-voltage control signals (like Arduino, Raspberry Pi, ESP32, and STM32) and high-voltage AC-powered devices. Its built-in optocoupler isolation enhances safety by preventing high-voltage interference from affecting the microcontroller.
How It Works
When a 5V DC input signal is applied to either channel, the optocoupler activates and triggers the internal solid-state switch (TRIAC for AC loads). This allows current to flow in the load circuit without generating sparks or mechanical noise.
Compared to traditional relays, this SSR offers:
Silent switching – no clicking sound
High-speed response – operates in microseconds
Long operational life – no moving parts to wear out
Improved safety – full isolation between control and load sides
Key Features
2-Channel Solid State Relay Module (SSR)
Control input: 5V DC
Capable of switching AC loads up to 240V (depending on relay rating)
Optocoupler isolation for safe operation
Two independent relay channels for controlling multiple devices
Compact design suitable for embedded projects
Works seamlessly with Arduino, ESP32, Raspberry Pi, and other controllers
Specifications
| Parameter | Value |
|---|---|
| Control Voltage | 5V DC |
| Control Current | ~12 mA per channel |
| Channels | 2 independent outputs |
| Load Voltage | 75–240V AC (typical) |
| Load Current | Up to 2A (per channel) – |
| Isolation | Optocoupler isolation |
| Response Time | < 10 ms |
| Module Size | ~55 mm × 35 mm × 20 mm |
Pin Configuration
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | 5V DC power supply (input) |
| 2 | GND | Ground reference |
| 3 | IN1 | Control signal for Relay 1 |
| 4 | IN2 | Control signal for Relay 2 |
| AC1 | Load | AC load terminal Relay 1 |
| AC2 | Load | AC load terminal Relay 1 |
| AC3 | Load | AC load terminal Relay 2 |
| AC4 | Load | AC load terminal Relay 2 |
Applications
Home automation (control of lights, fans, appliances)
Industrial machinery and automation
Smart IoT-based control systems
Robotics and motorized devices
Heater and pump control
Silent switching in sensitive environments
Multi-device smart power management
