Spring Set Brakes - How they Work

Spring-set brakes are electrically released and provide power-off failsafe braking.
spring set brake video thumb

Spring Set Brakes – How they Work

Spring-set brakes are electrically released and provide power-off failsafe braking.  This video shows how the work.






When electrical power is applied to an electromagnet coil the brake releases and a connected shaft is free to rotate.  When power is removed, the brake engages and a connected shaft stops rotating.


When an electromagnetic coil is powered with DC voltage a magnetic field is created. The magnetic force pulls an armature across a small airgap and compresses multiple springs embedded in the magnet housing. With the armature pulled in flat against the magnet face, the friction lining – which is connected to a shaft hub – is free to rotate.


When power is removed from the magnet, the springs push against the armature. The friction linking is then sandwiched between the armature and a secondary friction surface and a brake torque is created. Since the hub is connected to the friction lining through a splined connection, the shaft also stops rotating until power is applied to the coil again.


Spring applied or spring set brakes have loads of applications – elevators and escalators, wind turbines, cranes, servo motors, and more. KEB offers the  Spring-set Type 17 Double C-Face Brake with a variety of options and features. Our sales team can give you the full details and how each feature can be optimized to fit your needs. Use the contact link at the top of this page if you want to chat with us about our Combistop brakes!


You can read more about KEB’s Combistop Spring Set Brakes by reading the product page: Click Here to read more >>


More posts in this series


Electromagnetic Clutch

This video describes how KEB electromagnetic clutches operate. KEB clutches are electrically engaged and allow a friction connection between two shafts.

Servo Motor Brakes

KEB offers power-off spring-set servo motor brakes designed specifically for servo motor applications that require fail-safe braking.

Permanent Magnet Brakes

KEB’s permanent magnet brakes are commonly used in servo motor and robotic applications because they are compact and provide zero backlash power-off braking.

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