Unit Substations

IEM’s Unit Substations can utilize any configuration up to 27kV.  They are designed and assembled to accommodate any commercially available transformer for either indoor or outdoor applications.


  • Primary – Air terminal chamber, vacuum circuit breaker or load interrupter switch to 27kV
  • Transformer – Any commercially available transformer
  • Secondary – Vacuum circuit breaker or load interrupter switches, UL 891 or UL 1558 switchgear
  • Maximum flexibility with wide range of components and ratings to meet application specifics
  • Indoor or outdoor assemblies/construction
  • Configures to any commercially available transformer by leading manufacturers
  • Comprehensive substation composite layout drawings
  • Superior flexibility options including increased utilization of space
  • Improved voltage regulation and lowered power losses
  • Complete coordination of substation components with composite factory drawings ensures precise fit
  • Minimizes the use of secondary distribution cables and busway



Product Data Sheet