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ReliaGear XFMR Drive Isolation

Drive Isolation - ABB-LV Transformers

Drive Isolation Transformer (DIT) is designed to specifically handle the mechanical stresses, voltage distortions, and harmonics associated with silicon-controlled rectifiers (SCR) applications. Drive Isolation Transformers have symmetrically placed taps and added coil bracing to withstand the mechanical forces caused by severe SCR duty cycles. These features also help to protect the transformer from the regenerative duty and more frequent short-circuits associated with SCRs.

Drive Isolation transformers also help to filter the electrical noise caused by SCRs. The delta-wye designs meet the NEC requirements for grounded secondary neutrals that isolate primary distribution systems. Drive Isolation Transformers are UL 1561 listed for non-sinusoidal current loads.


  • Designed to help reduce operating costs
  • Easy access for installation and service


  • Unique core and coil design using grain-oriented silicon steel
  • Core and coil assemblies mounted on rubber isolation pads
  • Single piece front/back
  • Copper ground strap                                                                                                                   

Technical specifications

  • Type QL transformer
  • 15 - 220 kVA
  • Three-phase
  • Aluminum windings
  • NEMA 1 and/or 2 drip-proof enclosure
  • Weather shield available for field conversion to NEMA 3R

Certifications and standards

UL 1561 listed for non-sinusoidal current loads


  • AC or DC variable speed drives
  • Rectifier outputs