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ReliaGear XFMR Guard II Electrostatic Shielded

ABB LV Transformer - Guard II  and Guard III

Guard II™ transformers incorporate the same electrostatic shield as the Guard I plus additional noise and surge suppression components. These additional components provide transient voltage suppression.


  • Extra protection for sensitive equipment
  • Designed to help reduce operating costs
  • Easy access for installation and service


  • Full-width copper electrostatic shielding standard
  • Electrostatic shield ground wires are terminated to a common ground lug
  • Unique core and coil design using grain-oriented silicon steel
  • Core and coil assemblies mounted on rubber isolation pads
  • Single piece front/back
  • Lifting eyes provided in the top clamp
  • Lug kit included with most units up through 150kVA
  • Copper ground bar kit included with most units up through 150kVA
  • Copper ground strap

Technical specifications

  • 15 – 112.5 kVA
  • 120 db common mode noise protection
  • 60 db transverse mode noise protection
  • Enhanced electrical noise filter and surge suppression
  • Three-phase
  • 220 °C insulation system
  • 150 °C, 115 °C or 80 °C rise
  • Copper or aluminum windings
  • Sound levels below NEMA ST-20 limits
  • NEMA 1 and/or 2 drip-proof enclosure
  • Weather shield available for field conversion to NEMA 3R
  • NEMA 2 stainless steel (Type 316) available through 112.5 kVA

Certifications and standards

  • DOE Standards
  • Seismic qualified


  • Data centers
  • Medical facilities