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. 187-5369
Mfr. Part No.PhMKP400.3.25,00-S84
BrandVishay
SGD483.923
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. 192-3562
Mfr. Part No.B25161S0025M000
BrandEPCOS
SGD1,640.674
Each (In a Box of 10)
units
36kV ac - - 1 250nF Polypropylene Stud Mount MV APP 350mm 120mm 835mm -25°C - -
RS Stock No. 135-3607
Mfr. Part No.HDMKP 2.0-390 I
BrandVishay
SGD502.955
Each (In a Box of 4)
units
2kV dc - - - 390µF - Plug In HDMKP - - 235mm -40°C +80°C -
RS Stock No. 135-3609
Mfr. Part No.GLI 900-100 I
BrandVishay
SGD320.078
Each (In a Box of 4)
units
900V dc - - - 100µF - Plug In GLI - - 56mm -40°C +80°C -
RS Stock No. 136-5119
Mfr. Part No.C9TS6MD5830AARX
BrandKEMET
SGD85.33
Each (In a Box of 9)
units
440V ac - - - 3 x 83µF - Stud Mount C9T - - 230mm -25°C +55°C -
RS Stock No. 136-5105
Mfr. Part No.C9TS5MD5311AARX
BrandKEMET
SGD69.01
Each (In a Box of 12)
units
415V ac - - - 3 x 31.1µF - Stud Mount C9T - - 160mm -25°C +55°C -
RS Stock No. 192-3576
Mfr. Part No.B32305A4302B080
BrandEPCOS
SGD280.91
Each (In a Box of 4)
units
480V ac - - 3 138µF Polypropylene Stud Mount MKD - 136 Dia.mm 245mm -40°C +65°C -5%
RS Stock No. 135-3623
Mfr. Part No.GLI 700-230 B
BrandVishay
SGD480.30
Each
units
700V dc - - - 230µF - Plug In GLI - - 68mm -40°C +80°C -
RS Stock No. 135-3596
Mfr. Part No.PhMKP400.3.20,00-A84
BrandVishay
SGD145.153
Each (In a Box of 4)
units
400V ac - - - 3 x 132.6µF - Screw Mount phMKP - - 265mm - +65°C -
RS Stock No. 135-3616
Mfr. Part No.PhMKP440.3.28,10-A84
BrandVishay
SGD357.96
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
SGD216.59
Each
units
525V ac 20kvar - 3 3 x 77µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 135-3611
Mfr. Part No.GLI 1450-40 I
BrandVishay
SGD292.33
Each (In a Box of 4)
units
1.45kV dc - - - 40µF - Plug In GLI - - 56mm -40°C +80°C -
RS Stock No. 136-4924
Mfr. Part No.B25675A4302J040
BrandEPCOS
SGD249.30
Each (In a Box of 4)
units
440V ac 30kvar - - 3 x 164.4µF - Stud Mount MKK - - 192mm -40°C +60°C -5%
RS Stock No. 192-3564
Mfr. Part No.B25161T0010M000
BrandEPCOS
SGD1,488.26
Each (In a Box of 10)
units
40kV ac - - 1 100nF Polypropylene Stud Mount MV APP 250mm 120mm 870mm -25°C - -
RS Stock No. 192-3578
Mfr. Part No.B32305A5202B025
BrandEPCOS
SGD269.393
Each (In a Box of 4)
units
525V ac - - 3 77µF Polypropylene Stud Mount MKD - 136 Dia.mm 200mm -40°C +65°C -5%
RS Stock No. 135-3627
Mfr. Part No.GLI 900-150 A
BrandVishay
SGD240.00
Each
units
900V dc - - - 150µF - Plug In GLI - - 68mm -40°C +80°C -
RS Stock No. 136-5139
Mfr. Part No.C9TS6MD5274AARX
BrandKEMET
SGD66.19
Each
units
440V ac - - - 3 x 27.4µF - Stud Mount C9T - - 160mm -25°C +55°C -5%
RS Stock No. 187-5381
Mfr. Part No.PhMKP400.3.25,00-S84
BrandVishay
SGD347.16
Each
units
400V ac 25kvar - 3 3 x 165.8µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 187-5375
Mfr. Part No.PhMKP660.3.22,90-S84
BrandVishay
SGD479.998
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. 192-3563
Mfr. Part No.B25161S0050M000
BrandEPCOS
SGD2,579.225
Each (In a Box of 10)
units
36kV ac - - 1 500nF Polypropylene Stud Mount MV APP 350mm 160mm 985mm -25°C - -