28.DR.B28-8031 KEB
Wake Industrial LLC is not an authorized distributor of this product.
No Tariffs On US Orders- Straightforward Pricing: No Rush Fees, No Credit Card Fees
Current response time:
4 Minutes
51 Seconds
The KEB 28.DR.B28-8031 is part of the DR Motor Input Chokes series and supports a nominal current of 400 Amps with a 400 Volt input voltage. This device features an inductance of 0.081 mH, 3 supply phases, and has a power loss of 618 Watts. It measures 480 mm in width, 200 mm in height, and 390 mm in depth, with a weight of 61 kilograms.
To contact sales for pricing and lead time:
Payment Methods
Shipping Methods
Our Credentials
Product Description:
The 28.DR.B28-8031 is a three-phase input choke manufactured by KEB for the DR Motor Input Chokes series. In an automation cabinet, it is wired ahead of a frequency inverter or servo drive to smooth changes in the mains current, curb peak inrush current, and reduce conducted harmonics. By increasing source impedance, the component protects rectifier diodes, mitigates flicker on weak utility feeds, and lowers stress on motor insulation, helping the drive system meet electromagnetic compatibility and power-quality requirements.
Its magnetic circuit has an inductance of 0.081 mH, which is sufficient to reduce high-frequency current ripple without introducing resonance within the drive’s switching range. The coil is rated for three-phase grids up to 400 V and carries a continuous root-mean-square line current of 400 A. Under these operating conditions, the copper windings and magnetic core produce a calculated short-circuit voltage of 4%. This value represents the voltage drop across the choke at nominal current and can be used when selecting a suitable line reactor for the drive. Heat generated by winding resistance and core hysteresis amounts to 618 W, so the cabinet must provide adequate ventilation and maintain sufficient separation between the choke and temperature-sensitive electronics.
Bolted bus terminals accommodate conductors with a cross-sectional area of 14 mm², simplifying parallel cable arrangements that carry the high nominal current. The assembly weighs 61 kg and attaches to a mounting grid through centers spaced 450 × 120 mm apart, keeping the core mass near the cabinet’s structural supports. The choke has a width of 480 mm, a depth of 390 mm, and a height of 200 mm. These measurements allow cabinet layouts to reserve enough installation space without obstructing adjacent equipment. Adequate clearance around the housing also supports airflow and prevents heat from accumulating near the windings and magnetic core.
