Smoothing Reactors

MSI Smoothing ReactorSmoothing Reactors

DC Smoothing Reactor, similar to a DC choke uses its inductance to reduce ripple current on a DC line. They also limit inrush currents. Smoothing reactors are commonly found on electric passenger trains. Magnetic Specialties can design a smoothing reactor for the harshest environment.


  • Current ratings up to 2000 ADC
  • Single phase
  • Single or dual coil construction
  • Designed not to saturate up to customer specified overcurrent
  • Magnetic Specialties core leg construction results in quiet construction
  • Self-cooled, forced-air cooled, or water cooled
  • Aluminum or copper windings



  • Encapsulation
  • Temperature monitoring via thermal switches, thermocouples, or platinum RTDs
  • UL Recognized insulation system (Primary must be 600V or less). MSI UL Insulation systems are available in 130°, 180° and 220°C ratings
  • CE marking with declaration of conformity. ROHS and Low Voltage Directive where applicable
  • Private labeling with customer supplied nameplate artwork. Units that are private labeled cannot carry our UL label
  • NEMA 1 (indoor) or NEMA 3R (outdoor) enclosure with ANSI 61 gray powder coat finish
  • Final Test Reports with optional Certificate of Compliance



Download PDF