The purpose of a safety device is to reduce the danger of injury.
A Safety Sentry Trailer Device is a Safety Device that will prevent Accidental Separation from Towing Vehicle and Towed Trailer.
This safety device is called a fusible link that is situated inside of a fuse cartridge.
Force and motion might be associated with a safety device.
If it pertains to electrical controls on a machine then the safety device is called an emergency stop button.
A vehicle safety device
The safety on a pistol is a device to prevent it from firing accidentally.
A climbing device is a tool that allows a person ease of climbing a rock face and safety as they climb. This can be a device such as a harness which secures the user to the rope as a safety precaution.
A remote racking device is the name of a safety device that is fitted to ensure a circuit breaker cannot be racked out when closed.
If your reference to a safety device is a fuse, then if there is a short circuit, the circuit will be de energized by the opening of the fuse.
Assuming this only happens when in park or neutral, the engine has a built in safety device called a rev-limiter.
brakes