Drive isolation transformers

Drive isolation transformers are made to be used with AC and DC adjustable speed drives which generate mechanical stresses and harmonic currents beyond the design criteria of normal general purpose transformers. Marcus’ drive isolation transformers feature quality materials, unique design and increased efficiency.

Drive isolation transformer features



  • Heavy duty copper windings firmly braced to withstand mechanical stresses of drive operation.
  • Provides electrical isolation between primary line and drive wiring.
  • Standard double electrostatic shielding between input and output windings reduces problems caused by line voltage transients.
  • Available in standard and special primary temperature rise units for special applications.
  • Internal anti-vibration pads reduce transmission of noise and vibration.
  • All terminals clearly labeled for easy wiring.
  • Interleaved windings and wound core technology ensure excellent voltage regulation.

Sizing Selection

Don’t know what size of drive isolation transformer to purchase? Know the motor horsepower? Just follow the drive system manufacturer’s recommendations or select the corresponding kVA from the chart at right.

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Drive Isolation information