Working principle

The PRECIMA spring loaded brakes are electromagnetically actuated single disk brakes with two friction surfaces.

  • The braking power is applied by means of pressure springs.
  • The braking torque is generated in the currentless condition.
  • Ventilation (releasing) of the brake is effected electromagnetically.

In the absence of current, the compression springs (5), present in the magnet body (1) are pushing against the axially movable armature plate (2) which traps the brake rotor (3) against the motor housing surface (8). The brake torque is transferred to the shaft via the rotor and splined hub (4). By applying direct current voltage to the coil, a magnetic field is produced in the magnet body (1). This magnetic field attracts the armature plate (2) across air gap “a” and allows the rotor to rotate and neutralize the brake torque.


The spring loaded brake is supplied ready to be mounted.
The air gaps for FLC, FDW are fixed without adjustment.
The air gap of FDB, FDD and FDR brakes is preset before leaving our factory, they can be adjusted later without removing the brake from the motor.

The range of PRECIMA spring loaded brakes

  • FDB  Series:  classic solid fail- safe brake in several variations for universal use available.
  • FLC  Series: easy to assemble, low cost Holding Brake für applications with limited friction work.
  • FDD Series: low noise double brakes for applications with high safety requirements
  • FDR Series: double friction rotor brake for high torque requirements on limited mounting space


For triggering halfwave and bridge rectifiers, fast acting rectifiers, and current
detection relays are available.

Special solutions

In case of special mechanical and electrical requirements with respect to the spring loaded brakes, please contact our domestic and international experts.

Product information

  • Standard voltages are: 24 VDC, 48 VDC, 103 VDC, 180 VDC and 205 VDC
  • special voltages are available on request
  • Standard cable: size 05 and 06 – AWG 24 Size 08 to 30 – AWG 19
  • The air gap „a” is preset
  • The spring loaded brakes, type FDW/FLC has a fixed air gap „a“ wich ist given through the dimensions of the parts
  • Fixed bearing not required on the side of the brake
  • Asbestos-free friction linings: Due to the special processing of the friction surface, the rated  braking torques are achieved after a short running-in process
  • Standard: Protective rating IP 54 (mounted under the fan cowl of electric-motors).