ROBA®-alphastop®: Safety brake for A-bearing-side attachment onto Fanuc motors

ROBA®-alphastop®: Safety brake for A-bearing-side attachment onto Fanuc motors

  • Easy installation
  • Enclosed brake housing
  • Class of insulation F
  • Can be used for 100 % duty cycle

Application limits

Not suitable for use in liquid media.


The ROBA®‑alphastop® is a spring-applied, electromagnetic safety brake.

The ROBA®‑alphastop® is easy to install in an existing design between the servomotor and bell housing without modifications.

In de-energized condition, helical springs press against the armature disk. The rotor is held between the armature disk and the flange plate. The shaft is braked via the toothed hub.

When the power is switched on, a magnetic field is built up. The armature disk is attracted against the spring force to the coil carrier. The brake is released, and the shaft can rotate freely.

Product features

  • Application
  • Keeps axes secure in every position.
  • Optimal for vertical axes
  • Ideal for handling large weights
  • Mounting position
  • A-bearing-side on servomotors (also Fanuc)
  • Safety
  • Reliable due to fail-safe principle
  • Switching condition monitoring
  • Suitable for EMERGENCY STOP braking
  • Benefits
  • Short switching times
  • Design
  • Electromagnetic
  • Features
  • Complete unit with backlash-free shaft coupling (steel bellows, elastomer, or disk pack couplings)
  • Available with output shaft for direct mounting onto a hollow shaft gearbox
  • Available with adapter kit to adjust to different shaft distances
  • Construction - Protection class
  • Enclosed brake housing
  • Mechanical: protection IP10
  • Electric: protection IP54
  • Assembly and maintenance
  • Easy installation
  • Axial positioning to shaft not required.
  • Sound
  • Not noise-damped
  • Temperature
  • Class of insulation F
  • Duty cycle
  • Can be used for 100 % duty cycle


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Chr. Mayr GmbH + Co. KG
Eichenstraße 1, 87665 Mauerstetten, Germany
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