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General Purpose Isolation Transformer

Product Overview & Application

transformerGeneral Purpose Isolation transformers are used to lower distribution voltages (480 or 600V) to lower voltages (typically 120/240 or 208Y120) for power distribution within commercial or industrial buildings. These “two windings” transformers provide the electrical isolation required, and allow for short runs of high current, low voltage cables, reducing losses in the system, and reducing costs.
General Purpose Isolation transformer are suitable for supplying the following type of loads
  • General purpose lighting & electrical
  • Motors (without VFD controllers)
  • Resistive Heating

Features & Benefits

  • Core and coil assemblies are mounted on neoprene isolation pads to reduce noise
  • Bolted coil terminations suitable for copper or aluminum cables
  • Front & back covers are easily removable for service
  • NEMA 1 & 3R indoor (refer to catalogue for details) powder-coat drip-proof enclosure is standard. Weather shield kit is available for conversion to NEMA 3R outdoor.
  • NEMA 3R, 4 & 4X enclosures are available. Stainless Steel or aluminum enclosures are optional.
  • CSA Certified / UL listed
  • Qualified to the seismic requirements
  • Copper (Cu) or Aluminum (Al) windings
  • Copper C&C grounding strap
  • Robust packaging with top and side protection protects against shipping damage
  • Accessible mounting flanges with front/back slotted mounting holes make installation easier
  • 100% Factory tested for shorts and coil integrity, current and loss, voltage, impedance and noise.
  • Clear, Comprehensive Documentation and labeling
  • Core Manufactured with high quality grain oriented silicon steel

Product Specification

Capacity  3 to 333kVA Single Phase and 5 to 1,000kVA Three Phase
Voltage Class  1.2kV
Cooling  Self Cooled (ANN / AN)
Frequency  60Hz
Conductors  Copper (Cu) or Aluminum (Al) Windings
Insulation System  220°C (150°C rise) (optional 115°C or 80°C rise available)
Impregnation  Polyester Resin Dipped and Baked

 Meets North American Energy Efficiency Standards:

  • U.S. - (DOE 2016) DOE 10 CFR Part 431
  • Canada - (NRCan 2019) SOR/2018-201, Amd. 14 & ON Reg. 404/12
Primary Taps  Typically +/-2 x 2.5% taps (refer to dry type distribution transformer catalogue)
Sound Level  Meets NEMA ST-20
Enclosure Type  Type 1 or 3R Indoor (refer to catalog)
Enclosure Finish  ANSI/ASA 61 Grey
Warranty  12 Months (See Warranty and Limitations)
Quality System  ISO 9001:2015 Quality Management System
  • CSA Certified - File # LR34493 (5kV Max, 900kVA Max)
  • UL Listed - File # E108255 (600V Max, 750kVA Max)
  • UL Listed - File # E199463 (46kV Max, 10,000kVA Max)
Reference Standards
  • CSA C22.2 No 47
  • CSA C9
  • IEEE C57.12.01
  • IEEE C57.12.91
  • NEMA ST-20
Optional Features
  • Suitable for 50Hz Nominal Frequency
  • 115°C or 80°C Temperature Rise
  • Thermal Sensing & Indication
  • Thermometers (Analog/Digital)
  • Thermostat Alarm / Trip (N.O. /N.C. Contacts)
  • Electrostatic Shielding
  • K-Factor Rated to Handle Current Harmonics (K4, K9, K13, K20)
  • Anti-Condensation Strip Heaters
  • Surge Protection Devices
  • External Anti-Vibration Pads
  • Type 1, 2, 3R, 4, 4X or 12 Enclosure 
  • 304 or 316L Stainless Steel Enclosure
  • Custom Enclosure Finish (Color)