Solenoid brake
Encyclopedia
A Solenoid Brake is an electrically controlled brake
Brake
A brake is a mechanical device which inhibits motion. Its opposite component is a clutch. The rest of this article is dedicated to various types of vehicular brakes....

. The brake is turned on and off by an electrical solenoid
Solenoid
A solenoid is a coil wound into a tightly packed helix. In physics, the term solenoid refers to a long, thin loop of wire, often wrapped around a metallic core, which produces a magnetic field when an electric current is passed through it. Solenoids are important because they can create...

. Typically a spring engages the brake when unpowered, and the solenoid releases it when powered.

These are used along with a mechanical brake to manage the load on a cargo winch
Winch
A winch is a mechanical device that is used to pull in or let out or otherwise adjust the "tension" of a rope or wire rope . In its simplest form it consists of a spool and attached hand crank. In larger forms, winches stand at the heart of machines as diverse as tow trucks, steam shovels and...

. They're also used in electric wheel chairs, hoists, printers, photocopiers, etc.
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