ROBA®-alphastop®: Safety brake for mounting on the A-bearing side of Fanuc motors

ROBA®-alphastop®: Safety brake for mounting on the A-bearing side of Fanuc motors

  • Simple assembly
  • Closed brake housing
  • Insulation class F
  • Applicable for 100 % ED

Limits of use

Not suitable for use in liquid media.


The ROBA®-alphastop® is an electromagnetic safety brake actuated by quiescent current.

The ROBA®-alphastop® is installed in an existing design between the server motor and the bell housing simply and without modification.

When de-energised, coil springs press against the armature disk. The rotor is held between armature disk and flange plate. The shaft is braked via the toothed hub.

When the current is switched on, a magnetic field is built up. The armature disk is pulled against the spring force to the coil carrier. The brake is released and the shaft can run through.

Download catalogue

Product features

  • Application
  • Holds axes securely in any position.
  • Optimal for vertical axes
  • Optimal for handling large weights
  • Mounting position
  • A-bearing side on servo motors (also Fanuc)
  • Safety
  • Safe due to fail-safe principle
  • Switching status monitoring
  • Suitable for EMERGENCY STOP braking
  • Benefits
  • Short switching times
  • Design
  • Electromagnetic
  • Features
  • Complete unit with backlash-free shaft coupling (metal bellows, elastomer or disk pack couplings)
  • Available with output shaft for direct mounting on hollow shaft gearboxes
  • Available with adapter kit for adaptation to different shaft distances
  • Construction - Protection class
  • Closed brake housing
  • Mechanical: Protection class IP 10
  • Electrical: Protection class IP 54
  • Assembly and maintenance
  • Simple assembly
  • Axial positioning to the shaft not necessary.
  • Sound
  • Not silenced
  • Temperature
  • Insulation class F
  • Duty cycle
  • Applicable for 100 % ED


We are happy to advise you
Do you have any questions about our products?
Your enquiry will be processed quickly and competently.
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, 87665 Mauerstetten, Germany
Call us...
Tel. +49 (0)8341 804-0
...or write to us
Write message
Many thanks for your enquiry. We will deal with your request as soon as possible.
mayr+ Logo
With mayr+ you can use exclusive functions of our service and information offer.