3-Phase Load Reactors RWK5420

Three-phase dv/dt reactor 6% for motor protection


Three-phase dv/dt reactor 6% for motor protection

  • Reduction of drive output voltage dv/dt
  • Reduction of motor temperature
  • Increase of motor service life
  • Compact and economic open frame design
  • Standard catalog reactors up to 1000 A
  • UL rated materials used

Features and Benefits

Converts the rectangular PWM output voltage of motor drives into a smooth sine wave with low residual ripple
Elimination of premature motor damage caused by high dv/dt, overvoltages, cable ringing, motor overheating, and eddy current losses
Improves bearing life time because of bearing currents caused by circulating currents
Complies with IEC 60034-17* requirements for general purpose motors

Typical Applications

HVAC applications
Medium voltage applications, deployed in front of the step-up transformer
Retrofit installations with motor drives
Motor drive with long motor cable
Motor drive with multiple motors in parallel

Technical Specifications

Maximum continuous operating voltage

3x530 VAC

Nominal operating voltage

3x480 VAC

Rated currents

2.3 to 1000 A @ 45°C

Overload capability

1.5× rated current for 1 minute, once per hour

Residual ripple voltage


Impedance (Uk)

6% @ 400 V, 50 Hz and rated current

Motor frequency

0...60 Hz (up to 200Hz with derating, see user manual)

Motor cable length

Max. 100m depending of switching frequency (see user manual)

Switching frequency

fPWM 0 to 16kHz

High potential test voltage

P –> E 2480 VAC, 1 s

Overvoltage category

OV III (IEC 60664-1)

Pollution degree


Temperature range (operation and storage)

-40°C to +45°C fully operation

+45°C to +100°C derated operation*

-40°C to +100°C transport and storage

Climatic category


Protection category

IP 00

Flammability corresponding to

UL 94 V-2

Design corresponding to

EN 61558-2-20 or EN 60076-6

MTBF (Mil-HB-217F)

>500,000 h @ 45°C/480 V

* Iderated = Inominal*SQRT((Tmax-Tamb)/(Tmax-Tnominal)) = Inominal*SQRT((100°C-Tamb)/25°C)

Typical electrical schematic


Approvals & Compliances

CE Label
UKCA Label
RoHS Label
UL Recognized Label (USA)

For use on PWM side of AC or DC drives (power conversion equipment) only