--- product_id: 489549962 title: "Magnetic Switch Alarm Sensor Overhead Garage Door Contacts with L Bracket" brand: "wesua" price: "S$36" currency: SGD in_stock: true reviews_count: 13 category: "Wesua" url: https://www.desertcart.sg/products/489549962-magnetic-switch-alarm-sensor-overhead-garage-door-contacts-with-l store_origin: SG region: Singapore --- # Epoxy sealed waterproof Alloy zinc durable case Adjustable L bracket fit Magnetic Switch Alarm Sensor Overhead Garage Door Contacts with L Bracket **Brand:** wesua **Price:** S$36 **Availability:** ✅ In Stock ## Summary > 🔐 Secure your space with smart, sturdy sensor tech! ## Quick Answers - **What is this?** Magnetic Switch Alarm Sensor Overhead Garage Door Contacts with L Bracket by wesua - **How much does it cost?** S$36 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/489549962-magnetic-switch-alarm-sensor-overhead-garage-door-contacts-with-l) ## Best For - wesua enthusiasts ## Why This Product - Trusted wesua brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Waterproof Epoxy Seal:** Reliable performance rain or shine, no corrosion worries - • **Rugged Alloy Zinc Build:** Engineered for long-lasting durability in any environment - • **Wide 50mm Operation Gap:** Designed to detect even large door gaps with precision - • **Universal L Bracket Mount:** Customizable fit for most overhead garage door channels - • **Seamless Alarm Integration:** Effortlessly pairs with existing security systems for instant alerts ## Overview The WESUA Magnetic Switch Alarm Sensor features a robust alloy zinc case with waterproof epoxy sealing and an adjustable aluminum L bracket, ensuring easy installation and reliable detection for overhead garage doors with gaps ≥50mm. Compatible with 28V DC systems, it offers a normally closed reed switch that triggers alarms instantly upon door opening, making it ideal for both residential and industrial security upgrades. ## Description Magnetic contacts is widely used for alarm system(panel) to detect state of door. It consist of a reed switch part and a magnet part . When door closed, reed switch is effected by magnet and turn ON; when door open, reed switch is effected by magnet and turn OFF, trigger alarm. Contact type : NC (normally closed),switch OFF when door is opened Switch part material: alloy zinc L bracket Material : Aluminum Color: silver-grey Pack: 1pairs/bag Operation gap : ≥ 50mm Mounting type : Surface mounting Max. voltage : 28V DC Max. current : 0.2A Max. load : 3W Review: A Must-Have for Expanding Your Home Security System! - After noticing an increase in break-ins in our gated community, many of which were captured on Ring cameras, we decided to extend our Honeywell Home alarm system to include our courtyard gate for added security. These sensors were the perfect solution, and I’m thrilled with how well they’ve worked. The installation process was straightforward once we paired the sensors with the compatible wireless transmitter (we used this one: https://www.desertcart.com/dp/B002MA8GKW), and the system programming instructions provided by other reviewers were spot-on. The sensors integrate seamlessly into our alarm system, and once added, they function the same way as the other wireless window or door sensors in our home. However, I did encounter a minor issue during installation. Initially, we mounted the sensors directly to the iron gate, and this led to a problem where the sensors would randomly activate, causing false alarms. After some troubleshooting, we realized the issue was due to an interaction between the magnets in the sensor and the metal of the gate, which was triggering the alarm. The solution? We mounted the sensors with a small insulator (just a piece of plastic or rubber - see pictures) between the sensor and the gate, and since then, the system has worked flawlessly. For the past 4 months, we’ve had ZERO false alarms — just the peace of mind that comes with a secure gate. I highly recommend this product for anyone looking to enhance their home’s security, especially if you have access points like gates or fences that need monitoring. A few installation tips: ensure that your alarm system supports wireless sensors (most systems installed within the last 20 years should be compatible), and if you’re mounting these sensors to metal surfaces, remember to use an insulator between the sensor and the metal to avoid interference. This was a relatively easy, inexpensive way to expand our system, and we couldn’t be happier with the results. Hopefully, this little tip helps others avoid the frustration of false alarms and the need for multiple trips from your installer. Review: Easy to use - I used the magnet sensor with my ESP32. It worked really well. Setting it up was easy with only 2 wires. The magnet sensor respond fast in my project. ## Features - Alloy zinc material case make it quite sturdy - Metal tube protection - Epoxy sealed water proof - Adjustable with L bracket to fit most door-channel widths and easy installation - Used for overhead doors in both industrial and residential situations where a wide gap is present ## Technical Specifications | Specification | Value | |---------------|-------| | Brand | WESUA | | Color | silver-grey | | Item Dimensions L x W x H | 9.84"L x 1.89"W x 4.17"H | | Mounting Type | Wall Mount | | Power Source | Corded Electric | | Product Dimensions | 9.84"L x 1.89"W x 4.17"H | | Voltage | 28 volts | ## Product Details - **Brand:** WESUA - **Color:** silver-grey - **Power Source:** Corded Electric - **Product Dimensions:** 9.84"L x 1.89"W x 4.17"H - **Voltage:** 28 Volts ## Images ![Magnetic Switch Alarm Sensor Overhead Garage Door Contacts with L Bracket - Image 1](https://m.media-amazon.com/images/I/51qeAQzXKlL.jpg) ## Questions & Answers **Q: How is this wired: to a transmitter? to the garage opener? Why 28V?** A: It's a simple switch, more for someone knowledgeable about basic electronic components. You could hook it up to a power supply and a light, to turn on a light when it the magnet is nearby. Or you could hook it up to a smart house hub designed to take in simple signals. It's not just 28V, it's 0V-28V (simple answer, more volts = more heat = higher chance of fire. bigger wires reduces heat/volt, but increases cost of device, so they limit it to a chosen level, in this case 28V) **Q: Is this a normally open or closed switch? One reviewer said they received a normally open switch... but you state in the specs that its NC.** A: Closed when magnet engaged ## Customer Reviews ### ⭐⭐⭐⭐⭐ A Must-Have for Expanding Your Home Security System! *by L***N on April 9, 2025* After noticing an increase in break-ins in our gated community, many of which were captured on Ring cameras, we decided to extend our Honeywell Home alarm system to include our courtyard gate for added security. These sensors were the perfect solution, and I’m thrilled with how well they’ve worked. The installation process was straightforward once we paired the sensors with the compatible wireless transmitter (we used this one: https://www.amazon.com/dp/B002MA8GKW), and the system programming instructions provided by other reviewers were spot-on. The sensors integrate seamlessly into our alarm system, and once added, they function the same way as the other wireless window or door sensors in our home. However, I did encounter a minor issue during installation. Initially, we mounted the sensors directly to the iron gate, and this led to a problem where the sensors would randomly activate, causing false alarms. After some troubleshooting, we realized the issue was due to an interaction between the magnets in the sensor and the metal of the gate, which was triggering the alarm. The solution? We mounted the sensors with a small insulator (just a piece of plastic or rubber - see pictures) between the sensor and the gate, and since then, the system has worked flawlessly. For the past 4 months, we’ve had ZERO false alarms — just the peace of mind that comes with a secure gate. I highly recommend this product for anyone looking to enhance their home’s security, especially if you have access points like gates or fences that need monitoring. A few installation tips: ensure that your alarm system supports wireless sensors (most systems installed within the last 20 years should be compatible), and if you’re mounting these sensors to metal surfaces, remember to use an insulator between the sensor and the metal to avoid interference. This was a relatively easy, inexpensive way to expand our system, and we couldn’t be happier with the results. Hopefully, this little tip helps others avoid the frustration of false alarms and the need for multiple trips from your installer. ### ⭐⭐⭐⭐⭐ Easy to use *by D***O on March 6, 2026* I used the magnet sensor with my ESP32. It worked really well. Setting it up was easy with only 2 wires. The magnet sensor respond fast in my project. ### ⭐⭐⭐⭐⭐ Simple *by K***. on March 17, 2026* Needed a sensor for an old roll up door. This worked perfect. Easy to install. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/489549962-magnetic-switch-alarm-sensor-overhead-garage-door-contacts-with-l](https://www.desertcart.sg/products/489549962-magnetic-switch-alarm-sensor-overhead-garage-door-contacts-with-l) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-10-04*