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Class 8839 58M Enclosed AC Drives
Three Phase Drive Isolation Transformers
162
09/2003
© 2000–2003 Schneider Electric All Rights Reserved
Drive Isolation transformers are designed for maximum benefit when applied to an AC drive.
In addition to the functional comparison of a line reactor, drive isolation transformers are normally used
for one of the following reasons over a standard line reactor:
1. Match system voltage to drive rating.
2. Meet local or plant codes that require isolation.
3. Capable of correcting line voltage unbalance conditions commonly seen with open delta and corner
grounded delta distribution systems.
4. Provides continuity of service for nuisance grounding.
5. Reduces drive induced currents in supply feeder ground and limit ground fault currents.
6. Isolate the electrical common mode noise generated in solid state controllers from the distribution
system.
The Class 8839 58M Enclosed AC drives have a high fault withstand capability (up to 65,000 A or
100,000 A depending upon configuration). For these reasons, Square D does not require the use of a
drive isolation transformer for isolation purposes unless the system requires one or more of the six
functions listed above.
Notes:
To complete catalog number: Select the voltage required from chart. Insert the voltage code number in
place of the ( ) in the catalog number
Three Phase 60 Hz Class B (IEEE 597-1983)
HP Rating kVA Catalog Number
1–5 7.5 7T( )HDIT
7.5 11 11T( )HDIT
10 15 15T( )HDIT
15 20 20T( )HDIT
20 27 27T( )HDIT
25 34 34T( )HDIT
30 40 40T( )HDIT
40 51 51T( )HDIT
50 63 63T( )HDIT
60 75 75T( )HDIT
75 93 93T( )HDIT
100 118 118T( )HDIT
125 145 145T( )HDIT
150 175 175T( )HDIT
200 220 220T( )HDIT
250 275 275T( )HDIT
300 330 330T( )HDIT
400 440 440T( )HDIT
450 550 550T( )HDIT
500 550 550T( )HDIT
Voltage Codes
Code Primary Secondary
142 230 Delta 230Y/132
143 230 Delta 460Y/265
144 460 Delta 230Y/132
145 460 Delta 460Y/265
146 575 Delta 230Y/132
147 575 Delta 460Y/265