SM-226L-3Q Seco-Larm Overhead Door Mount N.C. Magnetic Contact w/ 3 Wires for N.O./N.C. Applications (One Pack)

Switch can not handle the wattage that it says. First time I hooked it up the reed switch welded itself closed.

Does what I needed. Has both normally open and normally closed contacts making it perfect for residential/commercial applications as well as automotive security applications.

I installed two of them on my garage doors in series with my thermostat to turn off the garage heater when the doors are opened. The install was a breeze (used the black and green for n.c.) and they work flawlessly. The pieces seem to be of pretty good quality, and I assume theyll last for years. These are cheaper elsewhere, but without prime shipping.

recieved as expected based on description. OEM would have been a better choice.

Works as expected. Used it to automate my garage door with a Raspberry Pi. Now garage door knows position when I give the command to open or close vs just actuate.

I have 4. Two can be wired different. Either n/o or n/c depends on which wires you use. They all work great.

It looks very well made, it was easy to install, and works great so far!

Excellent product. Far better than the run of the mill magnetic switches I first tried. These are very rugged and well made. I highly recommend them.

Installed and works perfectly. Mounting bracket for the magnet leaves lots of options. I moved the magnet on all three and trimmed the bracket on two. East to make work for my doors. I installed them on the top of the door with the contact on the overhead door opening.

Its a magnetic switch and it works. What more can I say about it. I am very pleased with it.