Solenoids are basically electromagnets: they are made of a big coil of copper wire with an
armature (a slug of metal) in the middle. When the coil is energized, the slug is pulled into the
center of the coil. This makes the solenoid able to pull from one end.
This solenoid in particular is nice and strong, and has a slug with a slanted cut and a good
mounting bracket. It's basically an electronic lock, designed for a basic cabinet or safe or door.
Normally the lock is active so you can't open the door because the solenoid slug is in the way. It does not use any power in this state. When 9-12VDC is applied, the slug pulls in so it doesn't
stick out anymore and the door can be opened.
The solenoids come with the slanted slug as shown above, but you can open it with the two
Phillips-head screws and turn it around so its rotated 90, 180 or 270 degrees so that it matches
the door you want to use it with.
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