Why must the hoisting mechanism use a fail-safe brake?

A hoist is a gravity-loaded system: if power is lost, the load will try to move in the unsafe direction (down). That’s why the hoisting mechanism typically requires a fail-safe brake—also called a spring-applied, power-released brake or power-off brake. In normal operation, power (electro-hydraulic, hydraulic, pneumatic, or electromagnetic) holds the brake released. If electrical power fails, a control component fails, or an emergency stop occurs, the brake automatically applies using spring force, preventing load drop or runaway motion.

On cranes and hoists, fail-safe braking is not just a preference—it’s a safety baseline. It also supports safe holding during micro-positioning, maintenance lockout, and unexpected supply interruptions. When selecting a fail-safe hoist brake, verify not only rated torque, but also duty cycle, thermal capacity for emergency dynamic stops, and the ability to hold the load for extended periods without slip.