Product Description:

The 15.DR.B08-9841 is a three-phase motor input choke manufactured by KEB within the DR Motor Input Chokes series. Mounted between the line supply and a frequency inverter, the component inserts controlled inductance that filters line current, reduces di/dt, and protects drive semiconductors from steep voltage edges. It therefore contributes to a longer service life for motors, drives, and adjacent automation hardware. A compact steel frame and resin-encapsulated windings keep vibration low, allowing the choke to be positioned close to other control electronics inside standard machine cabinets.

The choke has a body depth of 175 mm, a width of 178 mm, and a height of 110 mm, allowing it to fit in tight cabinet layouts while leaving clearance for service access. The laminated iron core provides an inductance of 0.98 mH, which limits the rate of current change so the drive input capacitors receive smoother waveforms and lower peak charging currents. With a continuous thermal rating of 30 A, the choke supports typical 11 kW-class drive systems and avoids saturation during short overloads. Line-side operation is supported across a frequency range of 45–65 Hz, enabling use with both utility and generator supplies.

Copper terminals accept conductors up to 10 mm², matching the cable cross sections normally used for the 30 A current path. When energized, the device dissipates approximately 76 W, so natural or forced airflow should be provided to keep the coil temperature within its limits. The assembly weighs 6 kg, making it manageable during installation while keeping it stable once bolted down. Mounting holes on 166 × 73 mm fixing centers simplify alignment on drilled subplates, and a relative voltage drop of 4% across the choke is expected under full load. The three-phase topology maintains balanced impedance on each line conductor, preventing unequal currents and preserving drive fault margins.