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. 192-3554
Mfr. Part No.B25161L0050O000
BrandEPCOS
SGD1,914.12
Each (In a Box of 10)
units
12kV ac - - 3 500nF Polypropylene Stud Mount MV APP 470mm 115mm 600mm -25°C - -
RS Stock No. 136-5125
Mfr. Part No.C9TS6MD5830AARX
BrandKEMET
SGD92.20
Each
units
440V ac - - - 3 x 83µF - Stud Mount C9T - - 230mm -25°C +55°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. 136-5114
Mfr. Part No.C9TS5MD6154AARX
BrandKEMET
SGD114.87
Each (In a Box of 9)
units
415V ac - - - 3 x 154µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 192-3579
Mfr. Part No.B32305A5252B025
BrandEPCOS
SGD246.445
Each (In a Box of 4)
units
525V ac - - 3 96µF Polypropylene Stud Mount MKD - 136 Dia.mm 230mm -40°C +65°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. 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. 136-4912
Mfr. Part No.B25675A4122J500
BrandEPCOS
SGD118.612
Each (In a Box of 9)
units
400V ac 12.5kvar 15kvar - 3 x 82.9µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 135-3597
Mfr. Part No.PhMKP400.3.25,00-A84
BrandVishay
SGD293.018
Each (In a Box of 4)
units
400V ac - - - 3 x 165.8µF - Plug In phMKP - - 265mm - +65°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. 135-3603
Mfr. Part No.PhMKP660.3.22,90-A84
BrandVishay
SGD340.915
Each (In a Box of 4)
units
660V ac - - - 3 x 55.8µF - Screw Mount phMKP - - 340mm - +65°C -
RS Stock No. 192-3561
Mfr. Part No.B25161S0012M000
BrandEPCOS
SGD1,371.933
Each (In a Box of 10)
units
36kV ac - - 1 125nF Polypropylene Stud Mount MV APP 250mm 120mm 760mm -25°C - -
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 - -
RS Stock No. 192-3552
Mfr. Part No.B25161L0025O000
BrandEPCOS
SGD1,398.606
Each (In a Box of 10)
units
12kV ac - - 3 250nF Polypropylene Stud Mount MV APP 470mm 115mm 500mm -25°C - -
RS Stock No. 135-3602
Mfr. Part No.PhMKP525.3.25,00-A84
BrandVishay
SGD263.40
Each (In a Box of 4)
units
525V ac - - - 3 x 96.2µF Polypropylene Screw Mount phMKP - - 265mm - +65°C -5%
RS Stock No. 192-3542
Mfr. Part No.B25161C0050O000
BrandEPCOS
SGD1,596.419
Each (In a Box of 10)
units
3.6kV ac - - 3 500nF Polypropylene Stud Mount MV APP 343mm 115mm 465mm -25°C - -
RS Stock No. 135-3599
Mfr. Part No.PhMKP440.3.28,10-A84
BrandVishay
SGD293.018
Each (In a Box of 4)
units
440V ac - - - 3 x 154µF - Screw Mount phMKP - - 265mm - +65°C -
RS Stock No. 187-5387
Mfr. Part No.PhMKP525.3.12,50-S84
BrandVishay
SGD227.45
Each
units
525V ac 12.5kvar - 3 3 x 48.1µF Polypropylene Stud Mount PhMKP - 88.2mm 190mm - +65°C -5%
RS Stock No. 187-5367
Mfr. Part No.PhMKP400.3.12,50-S64
BrandVishay
SGD296.948
Each (In a Box of 9)
units
400V ac 12.5kvar - 3 3 x 82.9µF Polypropylene Stud Mount PhMKP - 67.6mm 265mm - +65°C -5%
RS Stock No. 136-5130
Mfr. Part No.C9TS5MD5311AARX
BrandKEMET
SGD69.13
Each
units
415V ac - - - 3 x 31.1µF - Stud Mount C9T - - 160mm -25°C +55°C -