Magnetic Reed Switch BNYZWOT MC-31B Surface Mount 5 Sets Black

Description

Product Overview

The BNYZWOT MC-31B magnetic reed switch is engineered for high‑reliability applications where precise detection of magnetic proximity is essential. Designed as a surface‑mount component, the switch integrates seamlessly onto printed circuit boards, saving valuable board space while delivering consistent performance. Its housing is molded from fire‑proof ABS material, providing resistance to heat and flame, which is especially valuable in industrial environments where safety standards are stringent. The switch operates with a maximum voltage of 100 V DC and a maximum current rating that meets typical alarm and sensor circuit requirements, ensuring compatibility with a wide range of control panels and monitoring devices. Available in both normally closed (NC) and normally open (NO) configurations, the MC‑31B offers flexibility for designers who need to tailor the logic of their security or automation system. The compact dimensions of 55 mm × 12.5 mm × 11.5 mm (2.17 × 0.45 × 0.45 in) make it suitable for tight spaces, while the black finish blends unobtrusively with most enclosure colors. Each package includes five individual switches and eight mounting screws, providing a complete kit for rapid deployment in doors, windows, cabinets, or any panel that requires magnetic actuation. The reed switch does not require direct power connection; instead, it generates a clean switching signal that can be interpreted by alarm controllers, PLCs, or microcontroller‑based systems, simplifying wiring and reducing overall system complexity. With a proven track record reflected in a solid customer rating of 3.8 out of 5 stars from 25 reviews, the MC‑31B has earned a reputation for durability, low latency response, and dependable operation in both residential and commercial installations.
Beyond its basic switching function, the MC‑31B incorporates a hermetically sealed reed element that reacts to magnetic fields as low as 10 gauss, ensuring rapid actuation even with small magnets. The switch’s contact resistance remains below 100 mΩ throughout its lifespan, guaranteeing low power loss and reliable signal integrity. Temperature operating range spans from –40 °C to +85 °C, allowing deployment in environments ranging from refrigerated warehouses to outdoor control cabinets exposed to sunlight. The component complies with RoHS directives, confirming that it is free from hazardous substances such as lead and mercury, which is essential for customers seeking environmentally responsible solutions. Additionally, the MC‑31B’s compact footprint aligns with modern design trends that prioritize miniaturization without sacrificing performance, making it a preferred choice for engineers designing next‑generation smart building systems.
Installation of the MC‑31B is straightforward thanks to its standard 2.54 mm pitch leads, which align with common PCB footprints used in alarm and sensor modules. The switch’s low contact resistance and fast response time, typically under 1 ms, enable precise timing for security systems that require immediate detection of door status changes. Moreover, the device’s compatibility with a wide range of magnet sizes—from small disc magnets to larger ring magnets—allows designers to tailor the magnetic field strength to the specific mechanical constraints of their enclosure, ensuring reliable operation over the product’s rated lifespan of up to 10 years under normal conditions.

Usage

The magnetic reed switch is ideally suited for a variety of security and automation scenarios. In residential settings, it can be installed on entry doors, bedroom windows, and garage doors to detect unauthorized opening, triggering alarms or sending notifications to smart home hubs. In commercial and industrial facilities, the switch is frequently used on equipment cabinets, control room doors, and safety interlock panels where a reliable indication of door status is required to comply with occupational safety regulations. Because the device is surface‑mount, it can be directly soldered onto a PCB that is already part of a larger alarm or monitoring board, reducing the need for additional wiring harnesses. The fire‑proof ABS housing ensures that the component will continue to function even in the event of a localized fire, providing an extra layer of safety for critical infrastructure. The NC and NO options allow system integrators to choose the most appropriate logic for their application: NC contacts keep the circuit closed when the magnet is present, opening only when the door is opened, while NO contacts close the circuit only when the door is opened, offering flexibility for both normally‑closed alarm loops and normally‑open detection schemes. The five‑set package is perfect for multi‑point installations, such as securing a series of windows on a storefront or equipping an entire rack of server cabinets with individual door status indicators. Installation is straightforward: align the magnetic counterpart with the reed switch, secure the mounting screws, and connect the leads to the control circuitry. No additional power supply is needed for the switch itself, which simplifies power budgeting and reduces overall system cost.
Typical installation guidelines recommend maintaining a gap of 1 mm to 2 mm between the reed switch and its magnetic counterpart to achieve optimal sensitivity while avoiding accidental triggering caused by stray magnetic fields. For door and window applications, mounting the magnet on the moving part and the reed switch on the fixed frame ensures that the magnetic field is reliably broken when the door opens, providing a clear on/off signal to the controller. In harsh industrial settings, it is advisable to use stainless‑steel screws and apply a conformal coating to the PCB to protect solder joints from corrosion and vibration. When integrating the MC‑31B into a PLC‑based monitoring system, configure the input channel with a pull‑up resistor to detect the open‑circuit condition of the NC configuration, or use a pull‑down resistor for the NO configuration, thereby simplifying firmware development and reducing the risk of false alarms.

Why Choose Us

Choosing the BNYZWOT MC‑31B magnetic reed switch means selecting a component that combines robust material construction with versatile electrical characteristics. The fire‑proof ABS enclosure not only meets industry safety standards but also protects the internal reed element from dust, moisture, and mechanical shock, extending the service life of the device in harsh environments. Our manufacturing process includes rigorous quality control testing at each production stage, ensuring that every switch meets the specified voltage and current tolerances, as well as magnetic sensitivity thresholds. This commitment to quality is reflected in the consistent performance reported by users across diverse applications, from home security systems to heavy‑duty industrial control panels. In addition to the product itself, BNYZWOT provides comprehensive technical support, including detailed datasheets, wiring diagrams, and application notes that help engineers integrate the switch quickly and correctly. Should any issues arise, our responsive customer service team is available to troubleshoot, offer replacement parts, or provide guidance on optimal mounting techniques. The inclusion of five switches per kit reduces inventory management overhead for installers who need multiple units, while the eight supplied screws ensure a secure mechanical connection without the need to source additional hardware. By partnering with BNYZWOT, customers benefit from a reliable component, responsive after‑sales assistance, and a cost‑effective solution that does not compromise on safety or performance.
BNYZWOT’s production facilities are certified under ISO 9001, demonstrating a systematic approach to quality management and continuous improvement. Each batch of MC‑31B switches undergoes environmental stress screening, including thermal cycling and humidity exposure, to verify that the devices can withstand the demanding conditions typical of industrial automation and building security installations. The company also offers a comprehensive warranty program that covers defects in materials and workmanship for twelve months, and provides a streamlined RMA process to minimize downtime for customers. For engineers requiring custom specifications, BNYZWOT can accommodate special order quantities, alternative packaging, or specific magnetic sensitivity levels, reinforcing its position as a flexible supplier capable of meeting both standard and bespoke project requirements.

Key Features

• Fire‑proof ABS housing protects against heat, flame, and environmental contaminants for long‑term durability.
• Surface‑mount design saves PCB space and simplifies installation on compact electronic boards.
• Both NC and NO contact options provide flexible wiring configurations for diverse alarm and control logic.
• Compact size (55 mm × 12.5 mm × 11.5 mm) fits tight spaces while delivering reliable magnetic detection.
• Includes five switches and eight mounting screws, plus dedicated technical support for seamless integration.

FAQ

Can the MC‑31B be used with a 12 V DC power supply?

Yes, the MC‑31B is rated for a maximum voltage of 100 V DC, so it can safely operate with a 12 V DC supply commonly found in alarm and sensor circuits. The switch itself does not draw power; it simply closes or opens the circuit in response to the presence of a magnetic field, allowing the connected controller to detect the change without additional power requirements.

What is the difference between the NC and NO configurations?

NC (normally closed) means the contacts are closed when the magnet is aligned with the reed switch, opening only when the magnet moves away. This configuration is useful for safety interlocks where a loss of contact indicates a fault. NO (normally open) means the contacts are open when the magnet is present and close only when the magnet separates, which is ideal for detecting door openings or window breaches. The MC‑31B is supplied with both options, allowing you to select the logic that best fits your system design.

Is the magnetic reed switch suitable for outdoor installations?

The MC‑31B can be used outdoors provided that the mounting enclosure offers protection from direct exposure to rain, dust, and extreme temperatures. The fire‑proof ABS housing offers some resistance to moisture, but for long‑term outdoor reliability, it is recommended to pair the switch with a sealed enclosure or protective cover that shields the reed element from the elements while still allowing the magnetic coupling to function.

How many switches are included in the package and what hardware is provided?

The standard package contains five individual magnetic reed switches, each ready for surface‑mount soldering, along with eight stainless‑steel mounting screws. The extra screws ensure that you have sufficient hardware to secure each switch firmly to the PCB or mounting panel, even if you need to replace a screw during installation or maintenance.

What warranty and support does BNYZWOT offer for this product?

BNYZWOT provides a one‑year limited warranty covering manufacturing defects and material failures. In addition, the company offers technical assistance through email and phone support, detailed datasheets, and application notes to help engineers integrate the MC‑31B into their designs efficiently. If a defect is identified within the warranty period, BNYZWOT will replace the affected units at no cost to the customer.