Model PT3 Potential Transformer from Flex-Core
Model# PT3 | 5KV Class

Medium Voltage Potential Transformer

The PT3 is a 5kV rated potential transformer with 45kV BIL; and the two bushing PT3-2 can be connected for open-delta applications, while the single bushing PT3-1 are for wye-wye connections.

Typical voltage ratios are 2400:120V (20:1), 4200:120V (35:1) and 4800:120V (40:1). The PT3-2-45-332FF is rated 3300:110V, 30:1 and rated 50Hz.

The PT3 model is suitable for revenue grade metering applications.

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Detailed Model Specs

Accuracy Class:
– 0.3 WX, 0.6MY, 1.2Z at 100% rated voltage with 120V based ANSI burden. 0.6 WX – 1.2 MY at 58% rated voltage with 69.3V based ANSI burden.
Frequency: 60Hz
Insulation Class: 5.6kV
Basic Impulse Level: 45kV BIL
Thermal Rating:
– 600VA at 30°C Amb.
– 400VA at 55°C Amb.
Approximate Weight: 24 lbs.

  • Secondary Terminals are No. 10-32 screws with one lock washer & flat washer.
  • The core and coil assembly is encased in a plastic enclosure and vacuum encapsulated in polyurethane resin.
  • Thermal burden rating is for 120 volt secondaries.
  • 50Hz designs are available.
  • Indoor type
  • Fuses have 0.81″ or 1.0″ Dia. Caps and 4.25″ or 5″ clip centers.