What is the operating voltage of this 1 channel relay module?

The relay module is designed for 5V DC operation.

What load can this 5V relay module switch?

The stated maximum relay contact rating is 250V AC at 10A or 30V DC at 10A. Actual safe switching capability depends on the load type and installation.

Does the relay module support both high and low level triggering?

Yes. The onboard jumper allows the trigger mode to be selected between High-Level and Low-Level operation.

Does this relay module have optocoupler isolation?

Yes. The module uses an optocoupler-based input isolation stage between the control interface and relay-driving circuit.

What are NO, COM and NC on the relay?

COM is the common relay contact, NO is Normally Open, and NC is Normally Closed. They allow the load circuit to be configured according to the desired relay state.

Can I use this relay module with Arduino?

Yes. It is suitable for interfacing a relay switching stage with Arduino and other compatible microcontroller platforms, provided the controller can supply the required control signal and module power.

Can this module switch AC mains appliances?

The relay contacts are rated for up to 250V AC at 10A, but mains wiring is hazardous and must be performed with appropriate electrical safety practices and installation methods.

Is the relay shown in the product image guaranteed to be supplied?

No. The relay, PCB layout, markings, and appearance may differ from the product images depending on available stock, while the basic product function and stated specifications remain the target.

1 Channel 5V Relay Board Module – Optocoupler Isolation, High/Low Level Trigger, 250V 10A

Name: 1 Channel 5V Relay Board Module – Optocoupler Isolation, High/Low Level Trigger, 250V 10A
Brand: KathalTech
SKU: 1-channel-5v-relay-board-module-optocoupler-isolation-high-low-level-trigger-250v-10a
Price: 95.00 BDT
Availability: InStock
Rating: 5.0 (1 reviews)

0.0 (0 Reviews)

৳95.00

VAT inclusive; Computed calculations added locally.

The 1 Channel 5V Relay Board Module is an optocoupler-isolated relay interface for controlling higher-voltage or higher-current AC/DC loads from low-voltage microcontrollers. It supports AC 250V 10A or DC 30V 10A relay contact ratings, selectable High-Level or Low-Level triggering, onboard power/status LEDs, and NO/COM/NC screw terminals.

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Jump to: Overview Description Specifications Reviews (0) FAQs (8)

Overview

The 1 Channel 5V Relay Board Module provides a convenient interface between microcontroller projects and electrically switched loads. Its optocoupler-based input stage helps separate the control signal from the relay-driving circuit, making it suitable for Arduino, MCU, automation, robotics, and DIY control applications.

The onboard jumper allows the trigger mode to be configured for High-Level or Low-Level operation, giving greater flexibility when integrating the module with different controller boards and firmware logic. A green power indicator and red relay-status indicator provide quick visual feedback during operation.

The relay provides NO (Normally Open), COM (Common), and NC (Normally Closed) contacts through the screw terminal block. The stated contact rating is up to 250V AC at 10A or 30V DC at 10A, although actual safe switching capability depends on load type, wiring, installation, and relay contact conditions.

Note: Relay, PCB layout, component appearance, and product markings may differ from the product images depending on available stock.

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Verified Comments Listing

The 1 Channel 5V Relay Board Module is designed to let a low-voltage controller operate one electrically isolated relay channel. It can be used with common microcontroller platforms and provides a straightforward three-wire control interface along with screw terminals for the switched circuit.

The module includes an optocoupler isolation stage, selectable trigger logic, and LED indicators for power and relay status. The relay contacts are exposed as NO, COM, and NC, allowing the load circuit to be configured for either normally-open or normally-closed operation.

Features

1-channel 5V electromechanical relay module.
Optocoupler-isolated control interface.
Selectable High-Level or Low-Level trigger using onboard jumper.
Up to 250V AC / 10A or 30V DC / 10A contact rating.
NO, COM, and NC relay output terminals.
Green power LED and red relay-status LED.
Screw terminal connection for the switched load.
Suitable for Arduino, MCU, robotics, automation, and DIY electronics projects.
Compact 43 × 26.3 × 17mm module based on the supplied specification.

Applications

Arduino and microcontroller-controlled appliances.
Smart home and automation projects.
AC lamp and fan switching.
DC load switching.
Robotics and actuator control.
Pump and solenoid control.
Timed switching and remote-control projects.
Educational electronics and prototyping.

How to Use

Connect 5V DC to the module VCC and GND terminals.
Connect the controller's digital output to the IN control terminal.
Select HIGH or LOW trigger operation using the onboard jumper.
Connect the load circuit to COM and either NO or NC, depending on the desired default state.
Test the relay operation with the load disconnected before applying mains voltage.
Confirm the relay state using the onboard status LED.
For inductive loads such as motors, pumps, fans, or solenoids, use appropriate suppression and protection components suitable for the load.

Important Notes

High-voltage AC wiring can be dangerous. Disconnect mains power before making or changing connections.
The 250V/10A and 30V/10A figures are maximum contact ratings, not a guarantee that every load can safely be switched at 10A.
Inductive loads can produce substantially higher switching transients than resistive loads and may require suitable snubber, flyback, or surge-suppression measures.
Do not exceed the relay's voltage or current ratings.
Maintain appropriate insulation, wire gauge, terminal tightening, and clearance when working with mains voltage.
Do not expose the open PCB to moisture or conductive contamination.
Confirm the trigger jumper position before connecting the controller.
The relay and PCB appearance may vary according to available stock.
Allow approximately 5% measurement deviation for physical dimensions and related manual measurements.
The module should not be treated as a certified mains-safety device or as a replacement for professional electrical installation.

Package Includes

1 × 1 Channel 5V Relay Board Module

Specification	Details
Product Type	1 Channel 5V Relay Board Module
Relay Type	Electromechanical SPDT Relay
Operating Voltage	5V DC
Operating Supply Range	3V–5V DC
Trigger Mode	High-Level / Low-Level Selectable by Jumper
Trigger Current	Approx. 5mA input trigger specification; actual module drive current may vary
Optical Isolation	Optocoupler Isolation
AC Switching Rating	250V AC @ 10A Maximum
DC Switching Rating	30V DC @ 10A Maximum
Relay Contacts	NO / COM / NC
Power Indicator	Green LED
Relay Status Indicator	Red LED
Output Connection	3-Port Screw Terminal
Operating Temperature	-40°C to +85°C
Operating Humidity	20%–85% RH, Non-Condensing
Length	43mm
Width	26.3mm
Height	17mm
Weight	14g
Shipment Weight	0.018kg
Shipment Dimensions	8 × 5 × 2cm
Package Quantity	1 Piece