Fail-Safe

Fail-Safe is the fundamental design principle for a safety brake, dictating that it will automatically engage and bring the system to a safe, stopped state in the event of a power loss or control signal failure. The mechanism is specifically engineered to default to the “braked” condition.

In virtually all industrial applications, this is achieved through a “spring-applied, power-released” design:

1. Brake Applied by Default: A set of powerful mechanical springs provides the energy to apply the braking force. This is the brake’s natural, unpowered state.
2. Power Used to Release: External power—be it electrical (for an electromagnetic brake), hydraulic, or pneumatic—is actively used to work against the springs, compressing them and releasing the brake to allow machine operation.

The critical safety advantage is that if the control power is cut for any reason—an intentional stop, a component failure, a cable break, or a complete facility power outage—the releasing force instantly vanishes. The stored energy in the springs is then immediately unleashed, clamping the brake with full force and securely holding the load. This inherent, automatic action makes fail-safe brakes the mandatory, non-negotiable choice for any application where an uncontrolled load could lead to catastrophic failure, such as in crane hoists, elevators, winches, and inclined conveyors.