The ROBA^®‑servostop^® Cobot is a spring-applied, electromagnetic safety brake with hollow shaft design for use in the joints of lightweight robots.

When the brake is applied, a rotor disk is held between the armature disk and flange plate with friction lining pads in a frictionally-locking manner. When the power to the installed magnetic coil is switched on, the magnetic field pulls the armature disk against the force of the springs towards the coil carrier. The brake is released and the rotor disk with the friction lining can rotate freely.