BESTEP 1-way electromagnetic relay module with dual optocoupler isolation supports high and low trigger 5V

Description

Product Overview

The BESTEP 1-Way Electromagnetic Relay Module is a high-performance, industrial-grade control module designed to provide a safe and reliable interface between low-voltage logic circuits and high-power devices. Featuring dual optocoupler isolation, this module creates a robust physical and electrical barrier between your sensitive microcontroller (such as Arduino, ESP32, or STM32) and the high-voltage load side, effectively eliminating electrical noise, protecting against back-EMF spikes, and ensuring system stability .

This versatile module supports both High-Level and Low-Level Trigger modes, selectable via an onboard jumper, making it compatible with virtually any digital logic system without the need for external level shifters . Whether you are controlling household appliances with a 5V Arduino or industrial equipment with a 3.3V ESP32, this module offers a flexible and reliable switching solution. The 5V version is optimized for standard 5V microcontroller systems and provides stable relay coil activation with a 5V supply.

With a relay contact rating of 10A at 250V AC or 10A at 30V DC, this module can handle a wide range of loads, from LED lighting and fans to motors, pumps, and industrial machinery . Its SPDT (Single Pole Double Throw) configuration provides both Normally Open (NO) and Normally Closed (NC) terminals, offering maximum wiring flexibility for your specific application .

Key Features

• Dual Optocoupler Isolation: Features two optocouplers (typically PC817 or equivalent) providing enhanced electrical isolation between the control side and the high-voltage load side, ensuring superior noise immunity and protection against voltage spikes .

• Universal Trigger Modes: Supports both High Level (Active HIGH) and Low Level (Active LOW) trigger modes, selectable via an onboard jumper, allowing compatibility with any microcontroller or logic system .

• 5V Coil Voltage: Designed for standard 5V microcontroller systems (Arduino, STM32, etc.), with the relay coil drawing approximately 70mA-80mA when activated .

• High Power Switching: Relay contacts rated for 10A at 250V AC or 10A at 30V DC, suitable for controlling lights, fans, motors, solenoids, pumps, and industrial equipment .

• SPDT Contact Configuration: Provides Common (COM), Normally Open (NO), and Normally Closed (NC) terminals for maximum wiring flexibility—use NO for OFF-by-default operation or NC for ON-by-default operation .

• Clear Status Indicators: Onboard LED provides visual feedback: a power LED (green) illuminates when 5V power is applied, and a relay status LED (red) illuminates when the relay is activated .

• Standard Interface: Equipped with screw terminals for the high-voltage side and a 3-pin header (VCC, GND, IN) for the control side, facilitating easy integration .

• Built-in Flyback Diode: Includes a flyback diode across the relay coil to protect the driving circuit from inductive voltage spikes when the relay de-energizes .

• Compact and Durable: Small form factor with mounting holes for secure installation in control cabinets, enclosures, or on DIN rails .

Technical Specifications