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Industrial Control Transformers
Type EO Transformers
27
08/2005
© 1999–2005 Schneider Electric All Rights Reserved
TYPE EO TRANSFORMERS
The Type EO units are designed with exceptional voltage regulation. These
control transformers are constructed using traditional materials and
manufacturing techniques, and are designed for 25 VA to 5000 VA with a
55° C temperature rise. When exceptional regulation and very low
temperature rise are an absolute necessity, choose the Type EO units.
Selection Guide
1. Determine inrush and sealed VA of each coil in the control circuit and VA
of all other components.
2. Total all sealed VA of all operating coils and other loads VA (determines
minimal VA size required for the circuit).
3. Total the inrush VA of all coils that are starting at the same time and all
loads and coils that are running (using the regulation chart to give
possible units to be used).
4. Take VA size from step 2, go to standard VA size in chart below. Make
sure inrush VA from chart is greater than total VA from step 3. If not, go
to next larger VA size and repeat.
If your supply voltage is stable and fluctuates less than 5%, we recommend
you use the 90% secondary voltage column. If your supply voltage is not
stable and fluctuates more than 10%, we recommend you use the 95%
secondary voltage column. We recommend that you never use the 85%
secondary voltage column since magnetic devices lose life expectancy if
they are continuously started at 85% of rated voltage.
Type EO VA Ratings
Type
VA
60 Hz 50 Hz
EO17 25 25
EO1 50 35
EO18 75 75
EO2 100
70
EO3 150 120
EO19 200 200
EO15 250 200
EO4 300 240
EO16 350 280
EO51 500 400
EO61 750 500
EO71 1000 900
EO81 1500 1300
EO91 2000 1800
EO10 3000 3000
EO11 5000 5000
Type EO Listings
Listing File VA Range
UL E61239 25–5000
CSA LR37055, Guide 184-N-90 25–5000
Example:
This example assumes the following:
• Two NEMA size 0 contactors do not start together, but one
could be ON when the other starts.
• One NEMA size 2 contactor can start with either of the
other contactors.
• One pilot light at 2 VA
1. VA and inrush are:
NEMA 0: sealed 27 VA; inrush 245 VA
NEMA 2: sealed 37 VA; inrush 311 VA; pilot light 2 VA
2. Total VA: 27 + 27 + 37 + 2 = 93 VA
3. Total inrush VA: 245 + 311 + 27 + 2 = 582 VA
4. From Regulation Chart for Type EO at right below:
100 VA minimum unit; inrush 606 VA will not work at 90%
150 VA (next standard size); inrush 755 VA will work at 95%
Regulation Chart for Type EO
VA
Secondary Voltage
Inrush UL VA at 20% Power Factor Inrush UL VA at 40% Power Factor
95% 90% 85% 95% 90% 85%
25 95 ... 146 60 ... 119
50 164 213 277 123 168 225
75 387 487 622 284 375 798
100 479 606 770 346 463 613
150 755 1177 1532 567 930 1252
200 1260 1883 2419 910 1462 1950
250 1530 2327 2995 1115 1811 2419
300 2030 2981 3800 1455 2290 3038
350 2920 4586 5981 2180 3637 4903
500 4230 5984 7707 3120 4661 6229
750 7430 11460 14736 5380 8907 11891
1000 10300 16873 21734 7450 13145 17571
1500 19200 30042 39217 14500 23859 32179
2000 27750 45194 60022 21750 36901 50994
3000 31800 82333 108205 26750 66072 89509
5000 86100 148768 202077 72600 126887 175552