---
product_id: 248281967
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: "€ 15.43"
currency: EUR
in_stock: true
category: "Qwork"
url: https://www.desertcart.fi/products/248281967-qwork-mc-31-wired-surface-mounted-nc-magnetic-door-window
store_origin: FI
region: Finland
---

# Pack of 5 with 20 screws included NC (Normally Closed) contact type for reliable security 8mm±1.8mm actuation distance 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:** € 15.43
**Availability:** ✅ In Stock

## Summary

> 🛡️ Stay ahead of intruders with precision magnetic security!

## 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?** € 15.43 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/248281967-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

- • **Complete Installation Kit:** Includes 5 sensors and 20 screws for seamless setup across multiple entry points
- • **Precision Magnetic Sensing:** Detects door/window status within 8mm±1.8mm for instant alerts
- • **Durable Surface-Mounted Design:** Compact 64x12x12mm white plastic casing blends with modern interiors
- • **Versatile Security Application:** Ideal for doors, windows, cabinets—perfect for professional-grade home or office protection
- • **Reliable Normally Closed Circuit:** Ensures continuous monitoring by breaking signal only when opened

## Overview

The QWORK MC-31 is a wired, surface-mounted magnetic reed switch sensor designed for door and window security. Featuring a normally closed circuit and an actuation distance of 8mm±1.8mm, this pack of 5 sensors includes 20 screws for easy installation. Its compact white plastic design ensures discreet, reliable monitoring ideal for homes and offices seeking robust, professional-grade protection.

## Description

desertcart.com: QWORK MC-31 Wired Surface-Mounted NC Magnetic Door Window Contact Sensor Alarm Reed Switch, White, Pack of 5 with 20 Screws : Industrial & Scientific

## 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 |
| Best Sellers Rank | #47,757 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Reed Switches |
| Brand Name | QWORK |
| Circuit Type | 1-way |
| Color | White |
| Connectivity Protocol | X-10 |
| Connector Type | Screws |
| Contact Material | Plastic |
| Contact Type | Normally Closed |
| Control Method | Touch |
| Customer Reviews | 4.1 4.1 out of 5 stars (485) |
| International Protection Rating | IP65 |
| Item Weight | 0.01 Ounces |
| Manufacturer | QWORK |
| Material Type | Plastic |
| Model | WD3811 |
| Mounting Type | Door Mount |
| Number of Items | 5 |
| Number of Positions | 2 |
| Operation Mode | automatic |
| Part Number | WD3811 |
| Smart Home Compatibility | Not Smart Home Compatible |
| Switch Type | Reed Switch |
| Terminal | Screw |
| Unit Count | 5.0 Count |

## Product Details

- **Actuator Type:** Magnetic
- **Brand:** QWORK
- **Circuit Type:** 1-way
- **Connector Type:** Screws
- **Contact Type:** Normally Closed
- **Material:** Plastic
- **Mounting Type:** Door Mount
- **Operation Mode:** automatic
- **Switch Type:** Reed Switch
- **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)

## 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

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**Shop now:** [https://www.desertcart.fi/products/248281967-qwork-mc-31-wired-surface-mounted-nc-magnetic-door-window](https://www.desertcart.fi/products/248281967-qwork-mc-31-wired-surface-mounted-nc-magnetic-door-window)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-07-07*