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. 135-3597
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. 136-6304
Mfr. Part No.B25675A4052J000
BrandEPCOS
SGD136.62
Each
units
400V ac 5kvar 6kvar - 3 x 33.2µF - Stud Mount MKK - - 164mm -40°C +60°C -5%
RS Stock No. 136-5120
Mfr. Part No.C9TS6MD5960AARX
BrandKEMET
SGD81.472
Each (In a Box of 12)
units
440V ac - - - 3 x 96µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 136-6314
Mfr. Part No.B25669A5467J375
BrandEPCOS
SGD408.78
Each
units
525V ac 40kvar 48kvar - 3 x 154µF - Stud Mount MKK - - 355mm -40°C +55°C -5%
RS Stock No. 192-3580
Mfr. Part No.B32305A5282B025
BrandEPCOS
SGD289.01
Each (In a Box of 4)
units
525V ac - - 3 108µF Polypropylene Stud Mount MKD - 136 Dia.mm 230mm -40°C +65°C -5%
RS Stock No. 136-4928
Mfr. Part No.B25675A4252J080
BrandEPCOS
SGD226.77
Each (In a Box of 4)
units
480V ac 25kvar 30kvar - 3 x 115.1µF - Stud Mount MKK - - 192mm -40°C +60°C -5%
RS Stock No. 136-6325
Mfr. Part No.B25675A4252J015
BrandEPCOS
SGD195.49
Each
units
415V ac 25kvar 30kvar - 3 x 154µF - Stud Mount MKK - - 192mm -40°C +60°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. 136-4913
Mfr. Part No.B25675A4152J000
BrandEPCOS
SGD209.61
Each (In a Box of 4)
units
400V ac 15kvar 18kvar - 3 x 99.5µF - Stud Mount MKK - - 218mm -40°C +60°C -5%
RS Stock No. 192-3582
Mfr. Part No.B32305A5372B025
BrandEPCOS
SGD373.488
Each (In a Box of 4)
units
525V ac - - 3 143µF Polypropylene Stud Mount MKD - 136 Dia.mm 245mm -40°C +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 - -
RS Stock No. 135-3605
Mfr. Part No.HDMKP 1.1-420 I
BrandVishay
SGD263.275
Each (In a Box of 4)
units
1.1kV dc - - - 420µF - Plug In HDMKP - - - -40°C +80°C -
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. 135-3609
Mfr. Part No.GLI 900-100 I
BrandVishay
SGD326.365
Each (In a Box of 4)
units
900V dc - - - 100µF - Plug In GLI - - 56mm -40°C +80°C -
RS Stock No. 136-6322
Mfr. Part No.B25675A4252J080
BrandEPCOS
SGD249.44
Each
units
480V ac 25kvar 30kvar - 3 x 115.1µF - Stud Mount MKK - - 192mm -40°C +60°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. 192-3545
Mfr. Part No.B25161G0050M000
BrandEPCOS
SGD823.16
Each (In a Box of 10)
units
7.2kV ac - - 1 500nF Polypropylene Stud Mount MV APP 250mm 115mm 365mm -25°C - -
RS Stock No. 136-6312
Mfr. Part No.B25675A4302J040
BrandEPCOS
SGD279.62
Each
units
440V ac 30kvar - - 3 x 164.4µF - Stud Mount MKK - - 192mm -40°C +60°C -5%
RS Stock No. 187-5393
Mfr. Part No.PhMKP660.3.22,90-S84
BrandVishay
SGD325.88
Each
units
660V ac 22.9kvar - 3 3 x 55.8µF Polypropylene Stud Mount PhMKP - 88.2mm 340mm - +65°C -5%
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 -