8–390 A and 230–600 V

IMB DC Injection Brake

The IMB electronic motor brake provides fast, smooth and frictionless stopping of a three phase induction motor, by injecting controlled DC current to the motor windings, after the mains contactor opened.

Advantages at a glance

  • Preventing mechanical wear
  • Reducing stopping time of high inertia loads
  • Adjustable braking time
  • Auto stop – DC injection stops when motor stops
  • DIN rail mounting (Standard 10 A, option 17–58 A)
  • Easy installation and operation


For full view please move the table horizontally if necessary.
Brake Type kW at 400 V Width (mm) Height (mm) Depth (mm) Weight (kg)
IMB 10 5* 90 75 105 0.5
IMB 17 7.5 65 190 114 1.3
IMB 31 15 65 190 114 1.3
IMB 58 30 65 190 114 1.3
IMB 105 55 154 280 160 5.0
IMB 210 110 154 280 160 5.4
IMB 310 160 224 384 222 12
IMB 390 200 224 384 222 12
*5.5 kW at 41 V



Current limit

The voltage increases linearly from the “Initial Voltage“ pre selected point. If the adjusted “Current Limit” is reached, the voltage will stop ramping and remain at its level until the current is reduced below the adjusted “Current Limit“ level. In that case ramp up time is prolonged until the current has reduced below “Current Limit” level 

Soft starter output voltage

Although the current is limited the motor provides suitable torque to accelerate the driven load and reach “End of acceleration”. If the motor torque does not exceed the load torque the motor will not start. In the so rare cases severe damages might occur to the motor and starter.

Motor start measured with an oscilloscope
(Ch1, voltage; Ch2-4 current L1 – L3)

The oscillogram shows, the soft starter providing a smooth and stepless current and voltage ramp to the motor. The voltage ramps up until “Current Limit” is reached. After the motor is at nominal speed, the current will decrease, to the nominal motor current.


Internal bypass

  • This reliable components bypass the power electronics after the motor is at speed.
  • In addition the starters provide an auxiliary contact, allowing signaling of a successful motor start.Attention! Many of our competitors call these auxiliary relays “a bypass contact”!
  • The bypass function reduces the heat dissipation and eliminates the EMC load of the system.


The analogue product line provides simple potentiometer settings for all the parameters:

  • Familiar setting, similar to standard overload relays
  • Easy commissioning
  • Prior knowledge is not necessary
  • Status display via LEDs
  • ISA-A include motor protection functions