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Drives Service & Support > 1321 > Specifications > 1321-3T

The Allen-Bradley 1321 Isolation Transformers are designed to meet the standard horsepower, voltage ratings and harmonics of the Allen- Bradley variable speed drives.

Electrical
  Delta primary, wye secondary
60 Hz
Aluminum wound
Neutral terminal available for customer use
Standard Voltage Taps
  • 7.5-175 kVA 1-5.0% FCAN & FCBN
  • 220-880 kVA 1-2.5% FCAN & FCBN
Insulation System
  • Class 220
  • 150 degrees C Rise Over 40 degrees C Ambient
  • Peak 40 degrees C Ambient with 30 degrees C 24 Hour Avg.
Environmental
Elevation Up to 1,000 Meters. Above 1,000 Meters consult factory for derating
U.L. Listed File E112313
CSA Certified File LR3902
Construction
Enclosure NEMA Type 3R (IP32)
Heavy duty ventilated enclosure with metal screens protecting all vents and finished in ANSI 61 grey
Termination Transformers up to 75kVA have integral high and low voltage lugs installed, suitable for copper or aluminum cable installation
Conduit Entry Standard knockouts on units up to 175 kVA.
Mounting 5-51 kVA units suitable for either floor or wall mounting. 63-75 kVA units suitable for floor, wall or ceiling mounting with mounting kit 1321-3TWM2 (Style NH3). Larger units are floor mount only
General
Impedance 4-6% impedance (nominal).
Short Circuit Capability Meets UL and CSA short circuit withstand capability.
Overload Rating Windings designed to withstand overcurrent of 150% of rated load
for 60 Seconds or 200% of rated load for 30 Seconds.
Duty Cycle (1) start every (2) hours.
Thermostats Thermostats with 1 N.C contact in each coil, wired in series and integral on all units
K Factor 4
Custom Options
  50Hz units.
Electrostatic shield (60dB attenuation typical).
Core and coil construction (open).
Additional HP or kVA sizes, voltages, extra primary taps, copper wound units, etc.