Heavy Duty Wired Alarm Magnetic Garage Door Contact Switch Sensor NC with Adjustable Bracket

I used this product to replace an older set of alarmed garage door magnetic contacts that were of much lesser quality and had failed...I was concerned about the strength of any replacements until I found this product online. I must say, I am very pleased with its quality, ease of installation and performance. I highly recommend it. It can be purchased in a NC (normally closed by the magnet) or NO (normally open by the magnet) depending on customer need.

I ordered this to replace the plastic sensor that came with my Wi-Fi garage door module, and it’s a huge improvement. The rounded plate allows the door to slide off in case of accidental contact, preventing damage, and the stronger magnet provides a much larger detection range. This let me mount it higher on the door, avoiding unnecessary contact while still accurately sensing the door's status. Installation was quick and simple—just two wires to connect, making it highly versatile and compatible with many systems. No drilling required, and the only tools needed were a screwdriver (or impact driver) and wire cutters to strip and trim the wires. I used heat shrink for a secure connection, but electrical tape or wire nuts would also work. So far, I haven’t had any false readings, and the larger magnetic field makes it much more reliable than the original sensor. It also feels far more durable than the cheap plastic ones I’ve used before. While those were about half the price, I’ve already gone through two of them due to breakage—this one seems built to last. Definitely worth the investment, and I wish I had bought it in the first place!

OK

Bought these, as opposed to cheaper, smaller, plastic ones, as they had good reviews, appeared to be fairly heavy-duty, and yet were basic switches I needed for my dry-contact firmware for a home automation device (RATGDO for anyone counting). They are significantly larger than the small plastic ones, but since I've had them installed (maybe ~ a year now) they are rock-solid and just plain work. Love the wrapped metal cabling at the end, which makes me feel they are more durable (and they probably are), and I mounted them with 3M double-sided tape, to the aluminum rail and framing of my garage door.

Rubbish! Cast switch housing too thin at mounting points. Both broke with ease on installation.