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

Great purchase.

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

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.

Worked as described.

Was actually a NC contactor for an old school buzzer using 12v. Many others come NO without the three wires.

I have not installed this yet but I have tested it. It appears well made and functions as I expected it to. This switch has the ability to control two functions with NO and NC positions. I plan to use this for my garage door to tell if it open or closed (we have been known to leave the door open all night). The two contacts will let me have a red light if the door is open and a green light if it is closed without using a relay in my DIY indicator panel. This also lets me know of any faults because one light will always be on. That makes for the minimum of circuitry in the panel. I also found a magnetic switch with the same function for the man door.

Great product for the price

replaced a 30 year old alarm switch on the garage. Its 1/2 the size and works well.

Good

I wish I had found this years ago. This works perfectly on the top edge of my garage door