Safety device

A safety device which, if (or when) it fails, fails in such a way that will cause no harm (or at least a minimum of harm) to other devices or danger to personnel.

Designing a device or system in such a way that there are limits:

1. Motorized gates - In case of power outage the gate can be pushed open by hand with no crank or key required.
2. A control operation or function that prevents improper system functioning or catastrophic failure in the event of device malfunction or operator error.
3. A circuit breaker opening if there is a short circuit, rather than overheating or burning the wiring.

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