Answering The Call For Power Telephone: (518) 245-4400 Mon-Thurs 7:00 a.m. - 5:30 p.m. EST

EMI Filter

Espey developed this EMI filter for a variable frequency drive (VFD) application. The design is a passive, multi-section LC filter network tuned for high attenuation of conducted emissions for application of an active rectifier, AC to DC converter, eliminating the requirement for transformer isolation, or multi-pulse techniques. The end use is Navy shipboard power interface and EMI compliant.

Electrical Specifications

  • Input Voltage: 450 Vac, 3-phase, 60Hz, MIL-STD-1399/300A
  • Current Rating: 425A continuous, 600A for 60 seconds

Mechanical Specifications

  • Weight: 400 pounds maximum
  • Size: 35.50″ X 12.50″ X 7.50″
    Sealed enclosure
    Forced Air cooled


  • Meets the requirements of MIL-STD-461E when installed in the applicable variable frequency drive application.
  • Meets the requirements of MIL-STD-1399/300A capacity to ground (< 0.1uF)
  • Qualified to COTS + (4) requirement including:
  • MIL-S-901 shock
  • MIL-STD-167 vibration
  • MIL-STD-461 EMI
  • Innovative design to enable the application of active line rectification for AC to DC power conversion
Click here for the PDF version.