Guard I & II Noise Isolation Transformer

Guard I

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

 

Guard II

Guard II noise isolation transformers provide common mode noise attenuation plus an enhanced level of transverse mode noise attenuation for increased protection of sensitive electronic equipment.

Guard I Features

  • Grounded copper electrostatic shield between primary and secondary winding
  • 120dB common mode noise rejection
  • 30dB transverse mode noise rejection
  • 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 powder-coat drip-proof enclosure is standard. Weathershield kit is available for conversion to NEMA 3R outdoor.

Guard I Applications

  • Retail stores
  • High lightning strike areas
  • Small computer installations

 

Guard II Features

  • Transient overvoltage protection
  • Grounded copper electrostatic shield between primary and secondary winding
  • Noise suppressors and spike/surge suppressors
  • 120dB common mode noise rejection
  • 60dB transverse mode noise rejection
  • Single and three-phase ratings
  • Compliance with ANSI and NEMA standards
  • 220 degree C insulation system
  • UL listed
  • NEMA 2 enclosure

 

Guard II Applications

  • Schools and colleges
  • Large computer installations
  • Small commercial offices
  • Motor installations
  • Process controllers
  • Hospitals
  • X-ray rooms
  • Electrical laboratories
  • High lightning strike areas

 

Midwest gives you a choice in power quality transformers, so you can choose the one that best fits a particular situation and application. Typical choices are shown below.

Guard I and II Noise Isolation Transformer Applications

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