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. 136-6308
Mfr. Part No.B25675A5152J025
BrandEPCOS
SGD173.87
Each
units
525V ac 15kvar 18kvar - 3x 57.7µF - Stud Mount MKK - - 218mm -40°C +60°C -5%
RS Stock No. 136-5110
Mfr. Part No.C9TS5MD5920AARX
BrandKEMET
SGD99.736
Each (In a Box of 9)
units
415V ac - - - 3 x 92.2µF - Stud Mount C9T - - 230mm -25°C +55°C -
RS Stock No. 192-3541
Mfr. Part No.B25161C0050M000
BrandEPCOS
SGD659.373
Each (In a Box of 10)
units
3.6kV ac - - 1 500nF Polypropylene Stud Mount MV APP 175mm 115mm 340mm -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. 136-6319
Mfr. Part No.B25675A4052J015
BrandEPCOS
SGD136.57
Each
units
415V ac 5kvar 6kvar - 3 x 30.8µF - Stud Mount MKK - - 164mm -40°C +60°C -5%
RS Stock No. 187-5369
Mfr. Part No.PhMKP400.3.25,00-S84
BrandVishay
SGD509.883
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. 136-4923
Mfr. Part No.B25675A4282J140
BrandEPCOS
SGD238.54
Each (In a Box of 4)
units
440V ac 28.1kvar - - 3 x 154µF - Stud Mount MKK - - 207mm -40°C +60°C -5%
RS Stock No. 192-3539
Mfr. Part No.B25161C0025M000
BrandEPCOS
SGD607.933
Each (In a Box of 10)
units
3.6kV ac - - 1 250nF Polypropylene Stud Mount MV APP 175mm 115mm 290mm -25°C - -
RS Stock No. 187-5371
Mfr. Part No.PhMKP440.3.28,10-S84
BrandVishay
SGD496.638
Each (In a Box of 4)
units
440V ac 28.1kvar - 3 3 x 154µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 135-3628
Mfr. Part No.GLI 1450-40 I
BrandVishay
SGD335.45
Each
units
1.45kV dc - - - 40µF - Plug In GLI - - 56mm -40°C +80°C -
RS Stock No. 192-3575
Mfr. Part No.B32305A4302B040
BrandEPCOS
SGD276.768
Each (In a Box of 4)
units
440V ac - - 3 165µF Polypropylene Stud Mount MKD - 136 Dia.mm 275mm -40°C +65°C -5%
RS Stock No. 136-5129
Mfr. Part No.C9TS6MD6137AARX
BrandKEMET
SGD104.28
Each
units
440V ac - - - 3 x 137µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 192-3564
Mfr. Part No.B25161T0010M000
BrandEPCOS
SGD1,552.568
Each (In a Box of 10)
units
40kV ac - - 1 100nF Polypropylene Stud Mount MV APP 250mm 120mm 870mm -25°C - -
RS Stock No. 187-5379
Mfr. Part No.PhMKP400.3.20,00-S84
BrandVishay
SGD224.78
Each
units
400V ac 20kvar - 3 3 x 132.6µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
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. 192-3540
Mfr. Part No.B25161C0025O000
BrandEPCOS
SGD1,340.331
Each (In a Box of 10)
units
3.6kV ac - - 3 250nF Polypropylene Stud Mount MV APP 343mm 115mm 365mm -25°C - -
RS Stock No. 136-5121
Mfr. Part No.C9TS6MD6110AARX
BrandKEMET
SGD107.123
Each (In a Box of 12)
units
440V ac - - - 3 x 110µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 187-5385
Mfr. Part No.PhMKP440.3.28,10-S84
BrandVishay
SGD318.44
Each
units
440V ac 28.1kvar - 3 3 x 154µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 136-5135
Mfr. Part No.C9TS5MD5920AARX
BrandKEMET
SGD93.30
Each
units
415V ac - - - 3 x 92.2µF - Stud Mount C9T - - 230mm -25°C +55°C -
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 - -