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Power Factor Correction Capacitors

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How to Select a Power Factor Correction Capacitor

The most obvious benefit for correcting and improving power factor in a facility is to reduce utility costs by reducing or eliminating the penalty for a low power factor. Another benefit is that additional loads can be added to the facility for the same installed KVA (transformer) and, in many cases, postpone the need for system additions or upgrades. Capacitor selection is based on the motor’s horsepower, rpm and voltage.

To select the correct capacitor:

Step 1—Determine the motor’s horsepower located under the “HP” column in the Power Factor Correction KVAR chart shown at right. For example, select “40 HP”.

Step 2—Read across the row to select the correct motor rpm. For example, select the “1800 RPM” column. Where the row and column intersect is “12.5”, the suggested maximum capacitor (KVAR) needed to correct the power factor of a 40-HP motor rated at 1800 rpm.

Step 3—Determine the motor voltage and whether you need fused protection. Power fuses are required, per the NEC, if the capacitors are installed on the line side of the motor starter. In the table below, choose the “Select KVAR” dropdown beneath the heading matching your desired Voltage and Protection. Select 12.5 from the “Select KVAR” dropdown. You may now add this item to your cart or click the item number for more details.

HP 3600
RPM
1800
RPM
1200
RPM
900
RPM
720
RPM
600
RPM
1 0.5 0.75 1 1.5 1.5 2
1.5 0.75 0.75 1 1.5 2 2
2 1 1 1.5 2 2 3
3 1.5 1.5 1.5 3 3 3
5 2 2.5 3 3 3 5
7.5 2.5 3 3 5 5 5
10 3 3 5 5 7.5 7.5
15 5 5 5 7.5 7.5 10
20 5 5 7.5 7.5 12.5 17.5
25 7.5 7.5 7.5 10 12.5 17.5
30 7.5 7.5 10 12.5 15 22.5
40 10 12.5 15 17.5 22.5 25
50 12.5 17.5 20 20 22.5 30
60 15 20 20 25 30 35
75 20 20 25 27.5 30 40
100 20 30 30 35 40 45
125 25 35 35 40 45 50
150 30 40 40 50 50 60
200 35 50 50 60 60 90
250 40 60 60 75 85 100
300 45 60 75 100 100 120
350 50 75 90 120 120 135
400 75 75 100 130 140 150
450 75 90 120 140 160 160
500 100 100 150 160 180 180

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