Rex Power Magnetics

General Purpose Isolation Transformers

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General 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.

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General Purpose Isolation transformer are suitable for supplying the following type of loads

General purpose lighting & electrical
Motors (without VFD controllers)
Resistive Heating

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

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
Efficiency
- 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
Certifications
- 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)