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. 136-4924
Mfr. Part No.B25675A4302J040
BrandEPCOS
SGD254.195
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. 187-5379
Mfr. Part No.PhMKP400.3.20,00-S84
BrandVishay
SGD219.70
Each
units
400V ac 20kvar - 3 3 x 132.6µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 136-6306
Mfr. Part No.B25675A4252J040
BrandEPCOS
SGD244.64
Each
units
440V ac 25kvar 30kvar - 3 x 137µF - Stud Mount MKK - - 192mm -40°C +60°C -5%
RS Stock No. 135-3622
Mfr. Part No.PhMKP525.3.25,00-A84
BrandVishay
SGD335.96
Each
units
525V ac - - - 3 x 96.2µF Polypropylene Screw Mount phMKP - - 265mm - +65°C -5%
RS Stock No. 192-3560
Mfr. Part No.B25161S0010M000
BrandEPCOS
SGD1,371.933
Each (In a Box of 10)
units
36kV ac - - 1 100nF Polypropylene Stud Mount MV APP 250mm 120mm 760mm -25°C - -
RS Stock No. 192-3569
Mfr. Part No.B32305A4202B040
BrandEPCOS
SGD246.823
Each (In a Box of 4)
units
440V ac - - 3 110µF Polypropylene Stud Mount MKD - 136 Dia.mm 245mm -40°C +65°C -5%
RS Stock No. 192-3549
Mfr. Part No.B25161L0012M000
BrandEPCOS
SGD778.254
Each (In a Box of 10)
units
3.6kV ac - - 1 125nF Polypropylene Stud Mount MV APP 200mm 115mm 375mm -25°C - -
RS Stock No. 135-3597
Mfr. Part No.PhMKP400.3.25,00-A84
BrandVishay
SGD298.773
Each (In a Box of 4)
units
400V ac - - - 3 x 165.8µF - Plug In phMKP - - 265mm - +65°C -
RS Stock No. 136-5105
Mfr. Part No.C9TS5MD5311AARX
BrandKEMET
SGD70.365
Each (In a Box of 12)
units
415V ac - - - 3 x 31.1µF - Stud Mount C9T - - 160mm -25°C +55°C -
RS Stock No. 135-3599
Mfr. Part No.PhMKP440.3.28,10-A84
BrandVishay
SGD298.773
Each (In a Box of 4)
units
440V ac - - - 3 x 154µF - Screw Mount phMKP - - 265mm - +65°C -
RS Stock No. 136-5137
Mfr. Part No.C9TS5MD6123AARX
BrandKEMET
SGD91.80
Each
units
415V ac - - - 3 x 123µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 136-5122
Mfr. Part No.C9TS6MD6137AARX
BrandKEMET
SGD112.864
Each (In a Box of 9)
units
440V ac - - - 3 x 137µF - Stud Mount C9T - - 280mm -25°C +55°C -
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. 136-5121
Mfr. Part No.C9TS6MD6110AARX
BrandKEMET
SGD104.703
Each (In a Box of 12)
units
440V ac - - - 3 x 110µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 187-5370
Mfr. Part No.PhMKP440.3.25,00-S84
BrandVishay
SGD459.253
Each (In a Box of 4)
units
440V ac 25kvar - 3 3 x 137µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 136-5111
Mfr. Part No.C9TS5MD6108AARX
BrandKEMET
SGD89.733
Each (In a Box of 12)
units
415V ac - - - 3 x 108µF - Stud Mount C9T - - 280mm -25°C +55°C -5%
RS Stock No. 187-5367
Mfr. Part No.PhMKP400.3.12,50-S64
BrandVishay
SGD302.78
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. 136-4915
Mfr. Part No.B25675A4302J000
BrandEPCOS
SGD254.195
Each (In a Box of 4)
units
400V ac 30kvar - - 3 x 198.9µF - Stud Mount MKK - - 224mm -40°C +60°C -5%
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. 136-4917
Mfr. Part No.B25675A4122J515
BrandEPCOS
SGD156.296
Each (In a Box of 9)
units
415V ac 12.5kvar 15kvar - 3 x 77µF - Stud Mount MKK - - 200mm -40°C +60°C -5%