Power Factor Correction Capacitors

The power factor of a circuit, for individual equipment or for a larger power supply, is the measure used to determine the efficiency of the circuit. It is calculated using the real power (kW) and reactive power (kVAr) of a circuit, with the real power being that which is actually used to complete the task at hand and the reactive power being that which does not contribute to the task. The higher the power factor (between 0 and 1), the more efficient the circuit, with anything above 0.95 being considered highly efficient. For larger-scale circuits with a higher power load, such as a building's power supply, having a higher power factor results in lower excess charges from power suppliers.

What are power factor correction capacitors?

Power factor correction capacitors are used to increase the power factor of a circuit, bringing the measure closer to 1 and making the system more efficient. Capacitors are used when a lagging current - which is often found in inductive load circuits such as AC induction motors, arc welders, fluorescent lighting and air conditioning - causes the current and voltage to fall out of phase with each other and therefore generates more reactive power. Capacitors correct these variations in current and voltage input, bringing the two back to being closer in phase and improving the efficiency.

RS Components offer a range of power factor correction capacitors from industry-leading brands, including EPCOS, KEMET, Vishay and Wurth Elektronik.

Why is power factor correction important?

Power factor correction has many benefits on both the electrical systems being supplied and the bill payers. By bringing the efficiency up and reducing reactive power, grid instability can be reduced, as can costs. By reducing the reactive power generated in a system or piece of equipment, general power consumption will also decrease and this in turn leads to cost savings. Electricity bills for larger companies and factories can include additional charges, including capacitor charges and reactive power charges, which will also come down when power factor correction equipment is applied.


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Description Price Voltage kvar 50Hz kvar 60Hz Number of Phases Capacitance Dielectric Material Mounting Type Series Length Width Height Minimum Operating Temperature Maximum Operating Temperature Tolerance Minus
RS Stock No. 135-3621
Mfr. Part No.HDMKP 2.0-390 I
BrandVishay
MYR2,110.26
Each
units
2kV dc - - - 390µF - Plug In HDMKP - - 235mm -40°C +80°C -
RS Stock No. 187-5375
Mfr. Part No.PhMKP660.3.22,90-S84
BrandVishay
MYR1,655.105
Each (In a Box of 4)
units
660V ac 22.9kvar - 3 3 x 55.8µF Polypropylene Stud Mount PhMKP - 88.2mm 340mm - +65°C -5%
RS Stock No. 187-5369
Mfr. Part No.PhMKP400.3.25,00-S84
BrandVishay
MYR1,668.64
Each (In a Box of 4)
units
400V ac 25kvar - 3 3 x 165.8µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 135-3617
Mfr. Part No.HDMKP 1.1-420 I
BrandVishay
MYR1,087.04
Each
units
1.1kV dc - - - 420µF - Plug In HDMKP - - - -40°C +80°C -
RS Stock No. 187-5372
Mfr. Part No.PhMKP525.3.12,50-S84
BrandVishay
MYR1,058.988
Each (In a Box of 4)
units
525V ac 12.5kvar - 3 3 x 48.1µF Polypropylene Stud Mount PhMKP - 88.2mm 190mm - +65°C -5%
RS Stock No. 187-5391
Mfr. Part No.PhMKP525.3.25,00-S84
BrandVishay
MYR953.44
Each
units
525V ac 25kvar - 3 3 x 96.2µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 135-3605
Mfr. Part No.HDMKP 1.1-420 I
BrandVishay
MYR890.32
Each (In a Box of 4)
units
1.1kV dc - - - 420µF - Plug In HDMKP - - - -40°C +80°C -
RS Stock No. 135-3627
Mfr. Part No.GLI 900-150 A
BrandVishay
MYR827.55
Each
units
900V dc - - - 150µF - Plug In GLI - - 68mm -40°C +80°C -
RS Stock No. 135-3611
Mfr. Part No.GLI 1450-40 I
BrandVishay
MYR1,008.00
Each (In a Box of 4)
units
1.45kV dc - - - 40µF - Plug In GLI - - 56mm -40°C +80°C -
RS Stock No. 187-5373
Mfr. Part No.PhMKP525.3.20,00-S84
BrandVishay
MYR664.263
Each (In a Box of 4)
units
525V ac 20kvar - 3 3 x 77µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 187-5379
Mfr. Part No.PhMKP400.3.20,00-S84
BrandVishay
MYR742.97
Each
units
400V ac 20kvar - 3 3 x 132.6µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 135-3625
Mfr. Part No.GLI 900-100 I
BrandVishay
MYR1,154.70
Each
units
900V dc - - - 100µF - Plug In GLI - - 56mm -40°C +80°C -
RS Stock No. 135-3622
Mfr. Part No.PhMKP525.3.25,00-A84
BrandVishay
MYR1,136.13
Each
units
525V ac - - - 3 x 96.2µF Polypropylene Screw Mount phMKP - - 265mm - +65°C -5%
RS Stock No. 135-3616
Mfr. Part No.PhMKP440.3.28,10-A84
BrandVishay
MYR1,234.32
Each
units
440V ac - - - 3 x 154µF - Screw Mount phMKP - - 265mm - +65°C -
RS Stock No. 187-5389
Mfr. Part No.PhMKP525.3.20,00-S84
BrandVishay
MYR664.26
Each
units
525V ac 20kvar - 3 3 x 77µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 135-3610
Mfr. Part No.GLI 900-150 A
BrandVishay
MYR664.463
Each (In a Box of 4)
units
900V dc - - - 150µF - Plug In GLI - - 68mm -40°C +80°C -
RS Stock No. 187-5374
Mfr. Part No.PhMKP525.3.25,00-S84
BrandVishay
MYR1,473.605
Each (In a Box of 4)
units
525V ac 25kvar - 3 3 x 96.2µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 135-3597
Mfr. Part No.PhMKP400.3.25,00-A84
BrandVishay
MYR1,010.368
Each (In a Box of 4)
units
400V ac - - - 3 x 165.8µF - Plug In phMKP - - 265mm - +65°C -
RS Stock No. 135-3624
Mfr. Part No.PhMKP660.3.22,90-A84
BrandVishay
MYR1,290.42
Each
units
660V ac - - - 3 x 55.8µF - Screw Mount phMKP - - 340mm - +65°C -
RS Stock No. 187-5387
Mfr. Part No.PhMKP525.3.12,50-S84
BrandVishay
MYR705.80
Each
units
525V ac 12.5kvar - 3 3 x 48.1µF Polypropylene Stud Mount PhMKP - 88.2mm 190mm - +65°C -5%