QWORK MC-31 Wired NC Magnetic Door Window Sensor – White, Pack of 5

Description

Product Overview

The QWORK MC-31 is a wired, normally‑closed (NC) magnetic contact sensor designed for surface‑mounted applications on doors, windows, and cabinets. Constructed from durable white ABS plastic, the sensor features a compact footprint of 64 × 12 × 12 mm, making it unobtrusive while delivering reliable performance. Its magnetic actuation distance of 8 mm (± 18 mm) ensures consistent signal closure when the paired magnet is within range, and an open circuit when the magnet is removed, providing a clear indication of door or window status.

Each unit includes a 5.8 mm mounting hole, allowing straightforward installation with the supplied 20 screws. The sensor’s NC configuration means the circuit remains closed when the magnet is present, simplifying integration with alarm panels, home automation hubs, or industrial control systems. The MC‑31 model (WD3811) has been a top‑selling item in the Reed Switches sub‑category, reflecting its popularity among DIY enthusiasts and professional installers alike.

Designed for both residential security and industrial monitoring, the MC‑31 can be used in a variety of environments, from smart‑home door/window monitoring to equipment enclosure safety. Its robust plastic housing resists corrosion and mechanical wear, ensuring long‑term reliability even in high‑traffic areas.

Usage

The MC‑31 sensor is ideal for securing entry points in homes, offices, warehouses, and retail spaces. Install the sensor on the frame of a door or window and align the accompanying magnet on the moving part. When the door or window closes, the magnet engages the sensor, maintaining a closed circuit that can trigger an alarm, log an event, or activate a smart‑home routine.

Because the sensor is surface‑mounted, it can be retrofitted onto existing doors without drilling into the frame, preserving the integrity of the door structure. The included screws and mounting hardware simplify the installation process, allowing technicians to complete a full five‑sensor set in under an hour.

Beyond traditional security applications, the MC‑31 can be employed in industrial settings to monitor cabinet doors, equipment housings, and safety interlocks. Its NC logic is compatible with most PLCs and SCADA systems, providing a straightforward method to detect unauthorized access or equipment status changes.

For smart‑home enthusiasts, the sensor can be integrated with popular hubs such as SmartThings, Home Assistant, or Zigbee gateways via a simple relay interface, enabling automated lighting, notifications, or voice‑controlled alerts when a door is opened.

Why Choose Us

Choosing the QWORK MC‑31 means selecting a sensor that combines proven reliability with user‑friendly design. Manufactured by QWORK, a reputable brand in industrial electrical components, each sensor undergoes rigorous quality testing to meet ISO‑9001 standards. The white ABS plastic housing offers resistance to UV exposure and chemical solvents, extending the product’s lifespan in harsh environments.

Our pack of five sensors, complete with 20 mounting screws, provides excellent value for projects that require multiple contact points. The sensors are pre‑tested for consistent actuation distance, ensuring that every unit performs within the specified 8 mm range, reducing the need for field calibration.

Customer support is available to assist with installation queries, wiring diagrams, and integration guidance. We also offer a 12‑month warranty covering manufacturing defects, giving you confidence in the durability and performance of each sensor.

By selecting the MC‑31, you benefit from a product that has earned a high customer rating (4.1 out of 5 stars from over 450 reviews) and a strong sales rank within the Reed Switches category, reflecting its popularity and trust among users.

Key Features

• Compact white ABS housing blends discreetly with any décor while resisting wear.
• NC (normally‑closed) design provides reliable signal continuity for alarm and automation systems.
• 8 mm actuation distance ensures precise detection without false triggers.
• Easy surface‑mount installation with pre‑drilled 5.8 mm hole and included mounting screws.
• Comprehensive after‑sales support and 12‑month warranty for peace of mind.

FAQ

What is the difference between NC and NO contact types?

NC (normally‑closed) sensors keep the circuit closed when the magnet is present, opening only when the magnet moves away. NO (normally‑open) sensors do the opposite, closing the circuit when the magnet is removed. The MC‑31 uses NC, which is ideal for alarm systems that require a default closed state.

Can the MC‑31 be used with wireless smart‑home hubs?

Yes. Although the sensor is wired, it can be connected to a relay module that interfaces with popular smart‑home hubs such as SmartThings, Home Assistant, or Zigbee gateways, enabling wireless notifications and automation.

Is the sensor suitable for outdoor installation?

The MC‑31’s ABS plastic housing offers good resistance to moisture and UV light, making it suitable for sheltered outdoor applications like garage doors or garden sheds, provided the mounting area is protected from direct rain.

How many sensors can I install on a single alarm panel?

The MC‑31’s low current draw allows multiple sensors to be wired to a single alarm or control panel. Typically, up to 20 sensors can be connected without exceeding the panel’s input specifications, but always verify the panel’s load capacity.

What mounting hardware is included?

Each pack contains five sensors and twenty stainless‑steel screws sized for the 5.8 mm mounting hole, ensuring a secure and stable installation without the need for additional hardware.