ROBA®-topstop®: Modular safety system for servomotors

ROBA®-topstop®: Modular safety system for servomotors

  • Installation A-bearing-side
  • Modular safety system
  • Holds even with the motor removed

ROBA®-topstop® is a modular safety brake system for an A-bearing-side servomotor attachment.

ROBA®-topstop® is suitable for the following uses:

  • Use in industrial machines and systems with electrical drives
  • Secure axes under heavy gravitational load against unintended falling or crashing



In de-energized condition, several thrust springs press against an armature disk. The armature disk thus pushes the rotor against the flange. The flange and armature disk clamp and brake the rotor, which has friction linings for this. The rotor is connected with the shaft or shrink disk hub with positive locking via toothing.

A magnetic force is generated in the coil carrier by application of a coil nominal voltage. The magnetic force attracts the armature disk against the spring pressure to the coil carrier. Armature disk and flange release the rotor, the brake is released. The rotor can rotate freely, and accordingly, so too can the shrink disk hub or shaft.

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Product features

  • Application
  • Keeps axes secure in every position.
  • Optimal for vertical axes
  • Mounting position
  • On the motor, A-side
  • Duty cycle
  • Can be used for 100 % duty cycle
  • Safety
  • Reliable due to fail-safe principle
  • Switching condition monitoring
  • Suitable for EMERGENCY STOP braking
  • Benefits
  • Short switching times
  • High performance density
  • Long service lifetime
  • Low rotational moments of inertia
  • Design
  • Electromagnetic
  • Features
  • Single circuit brake with a bearing-supported drive shaft, suitable for toothed belt drives.
  • Single circuit brake with an integrated plug-in shaft coupling
  • Dual circuit brake with a bearing-supported output shaft
  • Basic brake module for special brake configurations
  • Optimum adaptation for individual axes construction due to different brake concepts
  • Temperature
  • Class of insulation F
  • Construction - Protection class
  • Protection IP54
  • Protection IP65 available
  • Sound
  • Not noise-damped
  • Assembly and maintenance
  • Low-maintenance

Application examples


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