Guard I Noise Isolation Transformer

Guard I™ noise isolation transformers provide common mode noise attenuation and transverse mode noise attenuation.

Guard I Features

  • Grounded aluminum electrostatic shield between primary and secondary winding
  • 120dB common mode noise protection
  • 30dB transverse mode noise protection
  • Three-phase
  • Compliance with ANSI and NEMA standards
  • 220C insulation system
  • Electrostatic shield ground wires are terminated to a common ground lug
  • UL Listed
  • NEMA 2 enclosure is standard. Weathershield kit is available for conversion to NEMA 3R outdoor.



  • Office buildings
  • Data centers
  • Lighting circuits
  • Medical facilities

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