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Products / AC Drives / AC Drive Accessories / KDR Line/Load Reactors
KDR Line/Load Reactors

KDR Line/Load Reactors

0.25 - 250HP, 208/240V, 480V, 575/600V, CHASSIS MOUNT & NEMA 1

Quick Specs

  • HP 0.25 - 250
  • VOLTAGE 208/240V, 480V, 575/600V, 50/60Hz
  • ENCLOSURE Chassis Mount (Open) with NEMA 1 kits available
  • IMPEDANCE Low "Z" (3%) or High "Z" (5%)

Product Overview

KDR line reactors are electrical components that help to protect 6-pulse rectifiers and power conversion devices such as variable frequency drives (VFDs).

When used in conjunction with a VFD, a KDR line reactor can help reduce harmonics and protect the drive from harmful voltage spikes. KDR line reactors are recommended on the input of each VFD in multiple drive applications.


  • Impedance Protection: Low "Z" and High "Z"
  • System Voltage: 208/240V, 480V, 575/600V
  • Ambient Temperature: 50° C (122° F) - Open; 40° C (104° F) - Enclosed
  • Altitude (Maximum): 2,000 meters (6,000 feet)
  • Derating necessary above 2,000 meters
  • Fundamental Frequency: 50/60 Hz
  • Short Term Overload Rating: Tolerate 200% rated I for a minimum of 3 minutes
  • Agency Approvals: cUL, UL; UL Recognized, CE Marked
  • Inductance Characteristics:
    • Minimum 95% L at 110% Load
    • Minimum 80% L at 150% Load
  • Input and Output: Available for either the line or load side of a VFD
  • Enclosures: Open Chassis, NEMA 1
  • Helps to meet IEEE 519-2014 requirements
  • Available in Ultra Low, Low and High Impedance
  • Strong durable design specifically for VFD applications
  • UL Listed
  • Made in the USA

The addition of a KDR unit to the output of a drive will dampen overshoot peak voltage, reduce motor heating and audible noise, helping to extend the life of the motor. The units will also help prevent inverter instantaneous overcurrent trips because they provide needed inductance when the load on an inverter has an abnormally high capacitance.
Any applications where traditionally either a 1.5% or 3% reactor would be applied.

Reduction of nuisance tripping caused by:
  • Transient voltages caused by capacitor switching
  • Line notching
  • DC bus overvoltage tripping
  • Inverter overcurrent and overvoltage
  • Lower injected percentage of harmonic current
  • Improving true power factor
  • Reducing cross-talk between drives

Any rugged application where traditionally a 5% reactor would be applied.

KDR High “Z” offers the same superior benefits as Low “Z” plus additional benefits which include:
  • Helping prevent drive component damage
  • Providing maximum harmonic mitigation without adding capacitance
  • Further improving true power factor
  • Adding impedance to drives with or without DC link chokes/reactors when more impedance is desired due to a relatively stiff source

Models & Pricing