---
product_id: 68147061
title: "KMtronic USB 4 Relay Board - RS232 Serial controlled, PCB"
brand: "kmtronic"
price: "€ 0.31"
currency: EUR
in_stock: false
url: https://www.desertcart.sk/products/68147061-kmtronic-usb-4-relay-board-rs232-serial-controlled-pcb
store_origin: SK
region: Slovakia
---

# 15A DC/10A AC Compatible with multiple software USB powered KMtronic USB 4 Relay Board - RS232 Serial controlled, PCB

**Brand:** kmtronic
**Price:** € 0.31
**Availability:** ❌ Out of Stock

## Summary

> 🔧 Power Your Projects with Precision!

## Quick Answers

- **What is this?** KMtronic USB 4 Relay Board - RS232 Serial controlled, PCB by kmtronic
- **How much does it cost?** € 0.31 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/68147061-kmtronic-usb-4-relay-board-rs232-serial-controlled-pcb)

## Best For

- kmtronic enthusiasts

## Why This Product

- Trusted kmtronic brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Ready to Use:** Fully assembled and tested for immediate deployment.
- • **High Current Capacity:** Handles up to 15A DC and 10A AC for robust performance.
- • **Software Compatibility:** Works effortlessly with LabVIEW, ProfiLab, and more.
- • **Seamless USB Integration:** Fully powered from USB for hassle-free connectivity.
- • **Versatile Power Handling:** Supports both 12V/24V DC and 120V/220V AC applications.

## Overview

The KMtronic USB 4 Relay Board is a fully assembled and tested device that provides seamless USB power integration, supporting a wide range of voltage and current specifications. Ideal for professionals using software like LabVIEW and DASYLab, this relay board is designed for immediate use in various applications.

## Description



## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | KMtronic |
| Part number | U4CR |
| Product Dimensions | 7.6 x 2 x 5.9 cm |
| Item model number | U4CR |
| Item Package Quantity | 1 |
| Batteries included? | No |
| Batteries Required? | No |

## Product Details

- **Connector type:** USB
- **Current rating:** 10 Amps
- **Brand:** KMtronic
- **Operation mode:** Automatic
- **Contact current rating:** 10 Amps

## Images

![KMtronic USB 4 Relay Board - RS232 Serial controlled, PCB - Image 1](https://m.media-amazon.com/images/I/514AHKpZWdL.jpg)
![KMtronic USB 4 Relay Board - RS232 Serial controlled, PCB - Image 2](https://m.media-amazon.com/images/I/514AHKpZWdL.jpg)

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**Shop now:** [https://www.desertcart.sk/products/68147061-kmtronic-usb-4-relay-board-rs232-serial-controlled-pcb](https://www.desertcart.sk/products/68147061-kmtronic-usb-4-relay-board-rs232-serial-controlled-pcb)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-17*