Solenoid - 12V SparkFun Solenoid - 12V is an electronic lock that can control door and cabinet access with the power of Electromagnetism. This latch/lock solenoid is powered by a 12VDC source. The latch is pulled in, allowing movement. Without power, the latch is extended, blocking movement. This Solenoid Latch comes with a mounting bracket that is removed with two screws. Once removed the solenoid can be rotated 180 and remounted. Paired with a relay you can easily have a low voltage system control this and other higher voltage devices.