5V 1 way solid state relay (DC controlled AC) High level or Low level

Description

Product Overview

The 5V 1 Way Solid State Relay (SSR) is a high-performance, semiconductor-based switching device designed to control AC loads using a low-voltage DC control signal. Unlike traditional electromagnetic relays that rely on moving mechanical contacts, this SSR uses phototriac isolation technology—an infrared LED and a phototriac sealed in a compact package—to switch high-voltage AC loads silently, without any moving parts .

This module is specifically designed for DC control of AC loads. It accepts a 5V DC control signal from microcontrollers like Arduino, ESP32, or Raspberry Pi, and switches AC loads up to 240V at 2A . The module features zero-crossing switching, meaning it only turns on when the AC load voltage crosses zero volts, minimizing electrical noise and reducing stress on connected devices .

A key feature of this SSR module is its flexibility—it is available in both High Level Trigger (relay activates when control pin is HIGH) and Low Level Trigger (relay activates when control pin is LOW) versions. The low-level trigger version is often preferred for safety, as the relay remains off during power-up or if the control signal is lost .

Unlike mechanical relays, SSRs offer silent operation, faster switching speeds, no contact wear or arcing, and significantly longer lifespan . They are ideal for controlling lighting, heating elements, fans, small motors, and other AC-powered devices in home automation, industrial control, and IoT projects .

Key Features

• Solid State Switching: Uses phototriac isolation with zero-crossing detection for silent, spark-free operation with no moving parts to wear out .

• AC Load Control: Designed to switch AC loads up to 240V at 2A (resistive). Suitable for lights, fans, heaters, and small motors .

• 5V DC Control: Accepts standard 5V logic signals from Arduino, ESP32, STM32, and other microcontrollers .

• Selectable Trigger Mode: Available in both High Level Trigger (active HIGH) and Low Level Trigger (active LOW) versions to match your application needs .

• Optical Isolation: Fully isolates the low-voltage control side from the high-voltage AC load side for enhanced safety and noise immunity .

• Built-in Snubber Circuit: Includes an internal RC snubber to protect against voltage spikes and reduce EMI when switching inductive loads .

• Status Indicator LED: Onboard LED provides clear visual confirmation of relay activation status.

• Fuse Protection: Many modules include a replaceable 2A/240V slow-blow fuse for overload and short-circuit protection .

• Compact PCB Design: Small footprint (approx. 34×25×25mm) with screw terminals for easy wiring and mounting .

Technical Specifications