3-Phase Load Reactors RWK305

Three-phase dv/dt reactor for motor protection


Three-phase dv/dt reactor 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 1100 A
  • UL rated materials used

Features and Benefits

Efficient reduction of high output voltage dv/dt from IGBT motor drives
Protection of motor coil insulation from premature aging and destruction
Significantly increased servie life of electric motors
High reliablility and secured production up time for mission critical applications
Reduced converter pulse load
Less interference propagation towards neighboring equipment of lines
€žOutput filter€œ with low impedance, ideal for processes requiring exceptional pre- cision and reproducibility of movements
Vacuum impregnation for reduced humming noise and high durability

Typical Applications

Servo drives
Close loop vector drives
Motor drive applications with short motor cables
Machinery comprising servo or torque motors
Pick and place machines

Technical Specifications

Nominal operating voltage

3x500 VAC

Rated operating voltage

3x530 VAC

Rated currents

4 to 1100 A @ 40°C

Impedance (uk)

0.8% @ 400 VAC, 50 Hz and rated current

Typical dv/dt reduction

≥factor 5

Motor frequency

0 to 60 Hz

Switching frequency fPWM

2 to 16 kHz

Overload capability

2 x rated current at switch on for 30 seconds

1.5 x rated current for 1 minute, once per hour

High potential test voltage

P –> E 3000 VAC for 3 sec

P –> P 3000 VAC for 3 sec

Insulation class

T40/N (200°C) for ≤182 A types

T40/F (155°C) for ≥230 A types

Overvoltage category

OV III (IEC 60664-1)

Protection category

IP 00 (KL types according to VBG 4)

Motor cable length

30 m max. @ 16 kHz (see derating curve page 2)

Ambient temperature range

-25°C to +100°C (25/100/21) operation and storage

Design corresponding to

EN 61558-2-20 (VDE 0570-2-20), UL 508C, CSA C22.2 NO. 14

Flammability corresponding to

UL 94 V-2

MTBF @ 45°C/480 V (Mil-HB-217F)

>500'000 hours

Typical electrical schematic


Approvals & Compliances

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

UL 508C up to 182 A. For use with AC or DC drives (power conversion equipment) only