---
product_id: 404703428
title: "QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws"
brand: "qwork"
price: "AED 52"
currency: AED
in_stock: true
reviews_count: 5
category: "Qwork"
url: https://www.desertcart.ae/products/404703428-qwork-mc-31-wired-surface-mounted-nc-magnetic-door-window
store_origin: AE
region: United Arab Emirates
---

# Actuation Distance: 8mm±18mm NC Type: Normally Closed IP65: Weather Resistant QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws

**Brand:** qwork
**Price:** AED 52
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in Safety, Unlock Peace of Mind!

## Quick Answers

- **What is this?** QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws by qwork
- **How much does it cost?** AED 52 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ae](https://www.desertcart.ae/products/404703428-qwork-mc-31-wired-surface-mounted-nc-magnetic-door-window)

## Best For

- qwork enthusiasts

## Why This Product

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

## Key Features

- • **👥 Pack of 5:** Perfect for multiple entry points, enhancing your security network.
- • **🌧️ Built to Last:** IP65 rated for durability against the elements.
- • **🔒 Secure Your Space:** Ensure peace of mind with reliable door and window security.
- • **🔧 Easy Installation:** Comes with 20 screws for hassle-free setup.
- • **📏 Precision Engineering:** Designed for optimal actuation distance, keeping your home safe.

## Overview

The QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch is a reliable security solution designed for doors, windows, and cabinets. This pack of 5 sensors, complete with 20 screws, features a normally closed contact type, ensuring that your spaces remain secure when the magnet is in proximity. With an actuation distance of 8mm±18mm and an IP65 weather resistance rating, these sensors are built for durability and precision, making them an ideal choice for enhancing your home security.

## Description

Feature:Product Information: Product name: Surface-mounted Magnetic Door Switch, Type: MC-31, Color: White, Material: Plastic Specification: Contact Type: NC, Hole Dia.: 5.8mm, Actuation Distance: 8mm±18mm NC means normally closed. If the magnet is closed to this switch, the signal is conductive, otherwise, if the magnet is far away from this switch, the signal is disconnectedIt is suitable for magnetic windows, doors, cabinets etc. Ideal for door, window security.Specifications:Material:PlasticNumber of item: 5Size: 64*12*12mm and 64*20*12mm（L * W * H）Color: whiteItem Package:Item Package Quantity :1

Review: Low cost perfect solution - Ok. Let’s face it that I know nothing about an alarm system. I have an ADT system and a construction worker accidentally broke this small sensor at my basement door. Well after 2 hours of waiting, 4 transfers, and horribly exasperating experience with ADT and so solution. I simply looked on the desertcart for something that looked similar to me and I found this part. The order arrived quickly, it was simple to attach, and it works perfectly. I’m still planning to change from ADT because it’s just terrible.
Review: Good - They are good but I ordered wrong one This one when door are closed they on . So order what you need

## Features

- Product Information: Product name: Surface-mounted Magnetic Door Switch, Type: MC-31, Color: White, Material: Plastic
- Specification: Contact Type: NC, Hole Dia.: 5.8mm, Actuation Distance: 8mm±18mm
- Sizes: 64*12.*12mm and 64*20*12mm（L * W * H),pack of 5 with 20 screws.
- NC Type: NC means normally closed. If the magnet is closed to this switch, the signal is conductive, otherwise, if the magnet is far away from this switch, the signal is disconnected.
- Applications: It is suitable for magnetic windows, doors, cabinets etc. Ideal for door, window security.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08FT91C1G |
| Actuator Type | Magnetic |
| Brand | QWORK |
| Brand Name | QWORK |
| Circuit Type | 1-way |
| Colour | White |
| Connectivity Protocol | X-10 |
| Connector Type | screws |
| Contact Material | Plastic |
| Contact Type | Normally Closed |
| Control Method | Touch |
| Controller Type | Ring |
| Customer Reviews | 4.0 out of 5 stars 455 Reviews |
| International Protection Rating | IP65 |
| Item Weight | 0.01 Ounces |
| Lower Temperature Rating | 1 Degrees Celsius |
| Manufacturer | QWORK |
| Material Type | Plastic |
| Model Number | WD3811 |
| Mounting Type | Door Mount |
| Number of Items | 5 |
| Number of Positions | 2 |
| Operation Mode | ON-OFF |
| Part Number | WD3811 |
| Smart Home Compatibility | Not Smart Home Compatible |
| Specification Met | CE |
| Switch Type | Reed Switch |
| Terminal | Screw |
| Unit Count | 5.0 Count |

## Product Details

- **Operation Mode:** ON-OFF
- **Contact Type:** Normally Closed
- **Connector Type:** screws
- **Brand:** QWORK
- **Terminal:** Screw

## Images

![QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws - Image 1](https://m.media-amazon.com/images/I/61qIPlQMfwL.jpg)
![QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws - Image 2](https://m.media-amazon.com/images/I/616i2l0lUGL.jpg)
![QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws - Image 3](https://m.media-amazon.com/images/I/614vFt4m25L.jpg)
![QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws - Image 4](https://m.media-amazon.com/images/I/61GftIIm3bL.jpg)
![QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws - Image 5](https://m.media-amazon.com/images/I/61pJVoxSalL.jpg)

## Questions & Answers

**Q: how long is the leader wires?**
A: The leads are about 6 inches long.

**Q: Type of reed switch? Voltage/Current specs needed**
A: The reed switch type is NC. No voltage/current required.

**Q: Does this have an end of line (eol) resistor internally?**
A: It is a simple reed switch with no resistor.

**Q: Do these work with ADT**
A: They shot

## Customer Reviews

### ⭐⭐⭐⭐⭐ Low cost perfect solution
*by S***N on 10 August 2023*

Ok. Let’s face it that I know nothing about an alarm system. I have an ADT system and a construction worker accidentally broke this small sensor at my basement door. Well after 2 hours of waiting, 4 transfers, and horribly exasperating experience with ADT and so solution. I simply looked on the Amazon for something that looked similar to me and I found this part. The order arrived quickly, it was simple to attach, and it works perfectly. I’m still planning to change from ADT because it’s just terrible.

### ⭐⭐⭐⭐⭐ Good
*by A***I on 3 January 2026*

They are good but I ordered wrong one This one when door are closed they on . So order what you need

### ⭐ Terrible quality inconsistent and defective
*by P***K on 15 November 2025*

I received five sensors. They are not sealed so water and moisture ingress would be a problem over time. But that's actually irrelevant because not a single one worked from the jump! I connected a seemingly identical old sensor I already had from another manufacture to some existing alarm wiring and it worked flawlessly. Then I connected each of the five new ones from this package, and every single one either didn't work at all or it was infuriatingly inconsistent! It would show closed then I'd take the magnet away and sometimes minutes later the sensor MIGHT show open, if it ever did. Then I'd bring the magnet back and sometimes it would close, other times nothing. SEVERE quality or design issues. Save yourself the headache and DO NOT BUY!

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*Product available on Desertcart United Arab Emirates*
*Store origin: AE*
*Last updated: 2026-05-30*