Myron Zucker all products MAXIMUM CAPACITOR RATINGS
MYRON t ZUCKER
SUGGESTED MAXIMUM CAPACITOR RATINGS
Table 1 - HIGH EFFICIENCY MOTORS AND OLDER DESIGN (PRE “T-FRAMES”) MOTORS*
No. of Poles and Nominal Motor Speed in RPM
Induction
Motor
Horsepower
Rating
3 1.5 14 1.5 15 1.5 20 2 27 2.5 35 3 41
5 2 12 2 13 2 17 3 25 4 32 4 37
7.5 2.5 11 2.5 12 3 15 4 22 5 30 6 34
10 3 10 3 11 3 14 5 21 6 27 7.5 31
15 4 9 4 10 5 13 6 18 8 23 9 27
20 5 9 5 10 6 12 7.5 16 9 21 12.5 25
25 6 9 6 10 7.5 11 9
30 7 8 7 9 9 11 10 14 12.5 18 17.5 22
40 9 8 9 9 10 10 12.5 13 15 16 20 20
50 12.5 8 10 9 12.5 10 15 12 20 15 25 19
60 15 8 15 8 15 10 17.5 11 22.5 15 27.5 19
75 17.5 8 17.5 8 17.5 10 20 10 25 14 35 18
100 22.5 8 20 8 25 9 27.5 10 35 13 40 17
125 27.5 8 25 8 30 9 30 10 40 13 50 16
150 30 8 30 8 35 9 37.5 10 50 12 50 15
200 40 8 37.5 8 40 9 50 10 60 12 60 14
250 50 8 45 7 50 8 60 9 70 11 75
300 60 8 50 7 60 8 60 9 80 11 90 12
350 60 8 60 7 75 8 75 9 90 10 95 11
400 75 8 60 6 75 8 85 9 95 10 100 11
450 75 8 75 6 80 8 90 9 100 9 110 11
500 75 8 75 6 85 8 100 9 100 9 120 10
Capacitor
2 4 6 8 10 12
3600 RPM 1800 RPM 1200 RPM 900 RPM 720 RPM 600 RPM
kVAr
Current
Reduction
%
Capacitor
kVAr
Current
Reduction
%
Capacitor
kVAr
Current
Reduction
%
Capacitor
kVAr
Current
Reduction
15 10 20 15 23
Capacitor
%
kVAr
Current
Reduction
%
Capacitor
kVAr
Current
Reduction
%
13
Table 2 - “T-FRAME” NEMA “DESIGN B” MOTORS*
No. of Poles and Nominal Motor Speed in RPM
Induction
Motor
Horsepower
Rating
2 1 14 1 24 1.5 30 2 42 2 40 3 50
3 1.5 14 1.5 23 2 28 3 38 3 40 4 49
5 2 14 2.5 22 3 26 4 31 4 40 5 49
7.5 2.5 14 3 20 4 21 5 28 5 38 6 45
10 4 14 4 18 5 21 6 27 7.5 36 8 38
15 5 12 5 18 6 20 7.5 24 8 32 10 34
20 6 12 6 17 7.5 19 9
25 7.5 12 7.5 17 8 19 10 23 12.5 25 17.5 30
30 8 11 8 16 10 19 15 22 15 24 20 30
40 12.5 12 15 16 15 19 17.5 21 20 24 25 30
50 15 12 17.5 15 20 19 22.5 21 22.5 24 30 30
60 17.5 12 20 15 22.5 17 25 20 30 22 35 28
75 20 12 25 14 25 15 30 17 35 21 40 19
100 22.5 11 30 14 30 12 35 16 40 15 45 17
125 25 10 35 12 35 12 40 14 45 15 50 17
150 30 10 40 12 40 12 50 14 50 13 60 17
200 35 10 50 11 50 11 70 14 70 13 90
250 40 11 60 10 60 10 80 13 90 13 100 17
300 45 11 70 10 75 12 100 14 100 13 120 17
350 50 12 75 8 90 12 120 13 120 13 135 15
400 75 10 80 8 100 12 130 13 140 13 150 15
450 80 8 90 8 120 10 140 12 168 14 160 15
500 100 8 120 9 150 12 160 12 180 13 180 15
Capacitor
2 4 6 8 10 12
3600 RPM 1800 RPM 1200 RPM 900 RPM 720 RPM 600 RPM
kVAr
Current
Reduction
%
Capacitor
kVAr
Current
Reduction
%
Capacitor
kVAr
Current
Reduction
%
Capacitor
kVAr
Current
Reduction
Capacitor
%
23 10 29 12.5 30
kVAr
Current
Reduction
%
Capacitor
kVAr
Current
Reduction
%
17
* For use with 3-phase, 60 hertz NEMA Classication B Motors to raise full load power factor to approximately 95%
These charts are based on averages for general motor types. If possible, it is preferable to obtain kVAr ratings based on values
found on the motor nameplate or provided by the motor manufacturer.
From IEEE STD 739-1995
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