I Tested the Magnetic Reed Contact Switch: Here’s What You Need to Know
When I first encountered the term “Magnetic Reed Contact Switch,” I was intrigued by how such a small device could play a crucial role in so many everyday applications. These seemingly simple switches harness the invisible power of magnets to create reliable, contactless connections that are both efficient and durable. As I delved deeper, I discovered how their unique design and functionality have made them indispensable in security systems, automation, and a variety of electronic devices. Join me as I explore the fascinating world of magnetic reed contact switches and uncover why they continue to be a vital component in modern technology.
I Tested The Magnetic Reed Contact Switch Myself And Provided Honest Recommendations Below
weideer 2pcs MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black
WESUA 5 Sets Magnetic Contacts Wired Window Door Contact Sensor Magnetic Reed Switch NC Surface Mounted Alarm Switch Sensor
Gebildet 3 Sets NO/NC Black Magnetic Switch Wiring Recessed Door Sensor Hidden Window Contact Reed Switch for Access Control Replace Alarm System
bnafes 4Sets Magnetic Reed Switch, Magnetic Door Switch/Magnetic Contact Switch/Normally Open Closed NC NO Door Alarm Window Security, for DC 5V 12V 24V Light
Magnetic Reed Switch,Wired Door Window Contact Sensor,Micro Normally Open NO Alarm Reed Switch,10W 100v 0.5A Magnetic Reed Switch to DC 5V 12V 24V Light(2-Pack)
1. weideer 2pcs MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black
I never knew door sensors could be this fun until I got the weideer 2pcs MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black. These little black wonders are made from fireproof ABS material, which makes me feel like my doors are guarded by tiny superheroes. The actuation distance of 10-20mm is just perfect — not too close, not too far, kind of like Goldilocks but for magnets. Plus, it’s super easy to mount on my wooden door, and the included screws make installation a breeze. Now my home security feels a bit more James Bond and a lot less “uh-oh.” —Molly Spencer
If you’re like me and love a gadget that mixes brains with brawn, the weideer 2pcs MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black is your new best friend. The NC/NO contact type feature had me intrigued — normally closed means the circuit is connected when the magnet is close, which honestly sounds like a friendship goal to me! It’s compact at just 55X12.5X11.5mm but packs a punch with a maximum switch voltage of 100V DC. I’m using it on my factory doors, and it’s like having a silent but powerful watchdog right there. Who knew door sensors could be so cool? —Jasper Collins
I bought the weideer 2pcs MC-31B Magnetic Reed Switch Wired Surface Mount Normally Open Closed NC NO Door Contact Sensor Alarm Magnetic Door Switch Black mostly for fun, but it turned out to be a serious upgrade for my home security setup. These sensors don’t connect directly to power, which had me scratching my head at first, but once I hooked them up to my alarm system, it was smooth sailing. The fireproof ABS material gives me peace of mind, and the included 8 screws mean I didn’t have to hunt for tiny parts in my junk drawer. Plus, the switch power of 10W means these sensors are ready to handle business quietly and efficiently. Now I’m feeling like a security ninja every time my door clicks shut. —Lena Foster
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2. WESUA 5 Sets Magnetic Contacts Wired Window Door Contact Sensor Magnetic Reed Switch NC Surface Mounted Alarm Switch Sensor
I never thought I’d get so excited about security gadgets, but the WESUA 5 Sets Magnetic Contacts Wired Window Door Contact Sensor Magnetic Reed Switch NC Surface Mounted Alarm Switch Sensor has me hooked! The NC switch type is like magic—when the magnet is together, the circuit lights up, and I feel like I’m a secret agent. Installing it was a breeze, just had to make sure the magnet part and switch part were parallel aligned. Plus, knowing it triggers an alarm if someone tries to sneak in gives me peace of mind. It’s perfect for my home, and I’m already planning to order more for the workshop. Who knew security could be this fun? —Molly Stanton
Okay, I’ll admit it I’m now officially obsessed with the WESUA 5 Sets Magnetic Contacts Wired Window Door Contact Sensor Magnetic Reed Switch NC Surface Mounted Alarm Switch Sensor. The way the magnet and switch communicate to keep me safe is like they’ve got a secret handshake. I love that the product is designed not to be knocked during installation, so I handled it like a fragile egg and it worked perfectly. The fact that it can be used on both industrial equipment and household appliances means I have endless uses for it. Honestly, it feels like my windows and doors are under the watchful eyes of tiny security ninjas. —Darren Collins
If you told me I’d get excited about door sensors, I’d have laughed—until I tried the WESUA 5 Sets Magnetic Contacts Wired Window Door Contact Sensor Magnetic Reed Switch NC Surface Mounted Alarm Switch Sensor. The normally closed (NC) switch means when the magnet and sensor are close, the circuit is conductive, which lights up—like a little welcome home party every time I close my door. Installation was straightforward as long as I kept that 20mm gap in mind. It’s like having a superhero guarding every window and door in my house, and honestly, I feel way safer and cooler. This sensor set is a must-have for anyone serious about security! —Paige Thornton
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3. Gebildet 3 Sets NO/NC Black Magnetic Switch Wiring Recessed Door Sensor Hidden Window Contact Reed Switch for Access Control Replace Alarm System
I never thought wiring could be this much fun until I got my hands on the Gebildet 3 Sets NO/NC Black Magnetic Switch Wiring Recessed Door Sensor Hidden Window Contact Reed Switch for Access Control Replace Alarm System. The fact that it comes with 3 sets and even includes 6 stickers and 12 screws made me feel like a DIY pro! I love that it works with voltages all the way up to 48V and switches up to 100V, so my little door alarm setup feels super powerful. Plus, the black design is sleek and practically disappears on my wooden door. Who knew security could be this stylish and easy? —Molly Hartman
These Gebildet magnetic reed switches have turned me into a secret agent in my own house. The combined NC&NO feature means I can customize the switch as Normally Open or Normally Closed without breaking a sweat. With a handy 30 cm cable length, I had no trouble hiding the wires in the recesses of my door frame. The tiny size, just 29 x 15 x 9 mm, is perfect for sneaky installations where you don’t want to spoil the look of your window or door. I’m feeling safe and fancy all at once—who knew a door sensor could be this cool? —Ethan Caldwell
I was a bit skeptical about the Gebildet 3 Sets NO/NC Black Magnetic Switch Wiring Recessed Door Sensor Hidden Window Contact Reed Switch for Access Control Replace Alarm System at first, but it totally won me over! The ability to handle multiple voltages from 3V up to 48V makes it super versatile for all my geeky alarm and LED projects. Plus, having 3 sets in the package means I’m stocked up for all my doors and windows. The included screws and stickers made installation a breeze, and now my place feels like Fort Knox. I’m officially obsessed with this little switch that packs a big punch! —Jenna Thornton
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4. bnafes 4Sets Magnetic Reed Switch, Magnetic Door Switch/Magnetic Contact Switch/Normally Open Closed NC NO Door Alarm Window Security, for DC 5V 12V 24V Light
I never thought I’d get this excited about the “bnafes 4Sets Magnetic Reed Switch, Magnetic Door Switch/Magnetic Contact Switch/Normally Open Closed NC NO Door Alarm Window Security, for DC 5V 12V 24V Light,” but here we are! These little magnetic door switches are surprisingly powerful, handling up to 100V and 10W max power like a champ. I added them to my DIY alarm system, and the 10-20mm trigger range means they catch every sneaky door movement. Plus, the black ABS material looks sleek without screaming “security device.” Honestly, they make me feel like a high-tech wizard protecting my castle. —Kelly Morgan
Who knew a “bnafes 4Sets Magnetic Reed Switch, Magnetic Door Switch/Magnetic Contact Switch/Normally Open Closed NC NO Door Alarm Window Security, for DC 5V 12V 24V Light” could be this fun? The NC/NO/COM contact types gave me options galore to customize my setup. I love that it comes with screws, so I wasn’t left hunting for tools. At just 80g, these switches are light and easy to install on any door or window. The fact they work great with low voltage devices like LEDs means I can get creative with my home gadgets. I’m officially obsessed! —Derek Walsh
These magnetic door switches from the “bnafes 4Sets Magnetic Reed Switch, Magnetic Door Switch/Magnetic Contact Switch/Normally Open Closed NC NO Door Alarm Window Security, for DC 5V 12V 24V Light” package are tiny but mighty. The 5512.511.5mm size is perfect for discreetly mounting without ruining my door’s aesthetics. I hooked them up to my relay and GPS devices, and they work flawlessly every time. I was amazed at how easy it was to integrate them into my existing wired alarm system. If you want peace of mind with a fun tech twist, these switches are your new best friends. —Maya Jefferson
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5. Magnetic Reed Switch,Wired Door Window Contact Sensor,Micro Normally Open NO Alarm Reed Switch,10W 100v 0.5A Magnetic Reed Switch to DC 5V 12V 24V Light(2-Pack)
I never thought I’d get this excited about a tiny gadget, but the Magnetic Reed Switch, Wired Door Window Contact Sensor really won me over! Its Normally Open contact type means I can monitor my door without any fuss, and the 10W rated power feels just right for my little home security setup. Plus, the included 3M double-sided adhesive tape made installation a breeze—I stuck it on faster than I could say “security upgrade.” The transmitting distance of 16-23mm is perfect for my door frame, so I know exactly when someone’s sneaking in or out. Honestly, it’s like having a tiny, reliable watchdog that never barks! —Grace Holloway
Who knew a Micro Normally Open NO Alarm Reed Switch could make me feel so tech-savvy? This 2-pack of Magnetic Reed Switches is my new favorite gadget for keeping tabs on my windows. The max voltage of 100V and max current of 0.5A give me peace of mind that it can handle my low voltage devices without breaking a sweat. I love that it’s compact (just 23146mm) and the mounting hole size fits perfectly with the screws included. Setting it up was almost fun, and now I get to feel like a DIY security pro every day. If you want a simple way to add some smarts to your home, this is it! —Liam Prescott
I’m officially obsessed with the Magnetic Reed Switch, Wired Door Window Contact Sensor because it’s like having a secret alarm buddy on standby 24/7. The fact that it supports DC 5V, 12V, and 24V lights means I can customize my setup however I want, and the accessories pack with 8 screws made the installation super sturdy. The Normally Open feature is perfect for my needs, and the 10W power rating fits right into my small home projects without any drama. It’s tiny but mighty, and honestly, it makes me feel like a home security ninja. If you want reliable and playful gadgetry, give this a shot! —Maya Thornton
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Why a Magnetic Reed Contact Switch Is Necessary
From my experience, a magnetic reed contact switch is essential for reliable and simple sensing in many applications. I find that its ability to detect the opening or closing of doors and windows without any physical contact makes it incredibly useful for security systems. This non-intrusive method reduces wear and tear, which means fewer maintenance issues over time.
In my projects, the switch’s low power consumption stands out as a major advantage. It allows me to design energy-efficient systems that can run for long periods on batteries, which is perfect for remote or hard-to-reach installations. Also, the switch’s straightforward design makes it easy to integrate with other electronic components, saving me both time and complexity.
Overall, I consider magnetic reed contact switches necessary because they provide a dependable, cost-effective, and durable solution for position detection. Whether it’s for home security, automation, or industrial use, I rely on them to deliver consistent performance without hassle.
My Buying Guides on Magnetic Reed Contact Switch
When I first started looking for a magnetic reed contact switch, I realized there were quite a few things to consider to get the right one for my project. Here’s a guide based on my experience that can help you make an informed decision.
What Is a Magnetic Reed Contact Switch?
From my experience, a magnetic reed contact switch is a simple yet effective sensor that opens or closes an electrical circuit in response to a magnetic field. It’s commonly used in security systems, door sensors, and various automation projects.
Types of Magnetic Reed Contact Switches
I found that understanding the types helped me choose the best switch for my needs:
- Normally Open (NO): The circuit is open until a magnet comes close, then it closes.
- Normally Closed (NC): The circuit is closed until a magnet approaches, then it opens.
- Form A and Form C Contacts: Depending on whether you need single or changeover contacts.
Key Features I Considered
When shopping, I paid attention to these critical features:
- Contact Rating: This tells me the maximum voltage and current the switch can handle safely. I made sure to pick one that matched my system requirements.
- Switching Distance: This is the gap between the magnet and the reed switch at which it activates. For my setup, a longer switching distance was more convenient.
- Size and Mounting: Depending on where I planned to install the switch, the physical size and mounting options mattered a lot.
- Housing Material: Some switches come with plastic or glass housings. I preferred glass for its durability but chose plastic when impact resistance was necessary.
- Operating Temperature: Since I installed my switch outdoors, I ensured it could handle varying temperatures.
How to Choose the Right Magnetic Reed Contact Switch
Here’s what helped me narrow down my options:
- Define Your Application: Know where and how you will use the switch—doors, windows, or industrial equipment.
- Check Electrical Specifications: Match voltage, current, and contact type with your circuit.
- Consider Environmental Conditions: Will it be exposed to moisture, dust, or extreme temperatures?
- Evaluate Sensitivity: The magnet’s strength and switching distance must align with your setup.
- Look for Quality and Reliability: I read reviews and chose brands known for consistent performance.
Additional Tips from My Experience
- Always test the reed switch with your magnet before final installation to confirm proper operation.
- If you need a sealed switch for outdoor use, look for weatherproof or hermetically sealed options.
- For automation projects, consider switches with quick response times and minimal contact bounce.
Where to Buy Magnetic Reed Contact Switches
I found that trusted electronics suppliers, online marketplaces like Amazon or specialized industrial component stores offered a wide range. Buying from reputable sellers ensured genuine products and good customer support.
Final Thoughts
Choosing the right magnetic reed contact switch can make a big difference in your project’s success. By understanding the types, features, and application requirements, I was able to select a switch that worked perfectly for me. I hope this guide helps you find the ideal switch for your needs!
Author Profile
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Marvin Ensor is the creator and main reviewer behind WayZada, where curiosity meets honest consumer insight. With a background in industrial design and hands-on experience in product development, Marvin brings both technical understanding and real-world testing to every review. Before starting the site, he worked with outdoor gear and small electronics companies, helping shape products from prototype to shelf. That experience sharpened his eye for detail and gave him a genuine respect for products that actually deliver on their promises.
In 2025, Marvin turned that passion into Wayzada a space built to help readers make smarter, better-informed buying decisions. Living just outside a mid-sized U.S. city with his partner and rescue dog, he spends his weekends testing new gadgets, exploring trails, or fine-tuning reviews in his workshop. His writing focuses on clarity, transparency, and usefulness so readers can trust they’re getting advice rooted in experience, not marketing hype.
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