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. 136-5130
Mfr. Part No.C9TS5MD5311AARX
BrandKEMET
kr 415,45
Each
Units
415V ac - - - 3 x 31.1µF - Stud Mount C9T - - 160mm -25°C +55°C -
RS Stock No. 192-3540
Mfr. Part No.B25161C0025O000
BrandEPCOS
kr 8 553,60
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. 187-5377
Mfr. Part No.PhMKP400.3.12,50-S64
BrandVishay
kr 1 510,46
Each
Units
400V 12.5kvar - 3 3 x 82.9µF Polypropylene Stud Mount PhMKP - 67.6mm 265mm - +65°C -5%
RS Stock No. 135-3597
Mfr. Part No.PhMKP400.3.25,00-A84
BrandVishay
kr 1 807,063
Each (In a Box of 4)
Units
400V dc - - - 3 x 165.8µF - Plug In phMKP - - 265mm - +65°C -
RS Stock No. 136-5125
Mfr. Part No.C9TS6MD5830AARX
BrandKEMET
kr 553,93
Each
Units
440V ac - - - 3 x 83µF - Stud Mount C9T - - 230mm -25°C +55°C -
RS Stock No. 136-4915
Mfr. Part No.B25675A4302J000
BrandEPCOS
kr 1 070,238
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. 136-6312
Mfr. Part No.B25675A4302J040
BrandEPCOS
kr 1 650,17
Each
Units
440V ac 30kvar - - 3 x 164.4µF - Stud Mount MKK - - 192mm -40°C +60°C -5%
RS Stock No. 192-3570
Mfr. Part No.B32305A4252B040
BrandEPCOS
kr 1 596,413
Each (In a Box of 4)
Units
440V ac - - 3 137µF Polypropylene Stud Mount MKD - 136 Dia.mm 245mm -40°C +65°C -5%
RS Stock No. 135-3599
Mfr. Part No.PhMKP440.3.28,10-A84
BrandVishay
kr 1 765,513
Each (In a Box of 4)
Units
440V dc - - - 3 x 154µF - Screw Mount phMKP - - 265mm - +65°C -
RS Stock No. 187-5389
Mfr. Part No.PhMKP525.3.20,00-S84
BrandVishay
kr 2 518,82
Each
Units
525V 20kvar - 3 3 x 77µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 136-6321
Mfr. Part No.B25675A4122J515
BrandEPCOS
kr 1 224,02
Each
Units
415V ac 12.5kvar 15kvar - 3 x 77µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 192-3550
Mfr. Part No.B25161L0012O000
BrandEPCOS
kr 4 462,906
Each (In a Box of 10)
Units
12kV ac - - 3 125nF Polypropylene Stud Mount MV APP 470mm 115mm 400mm -25°C - -
RS Stock No. 192-3541
Mfr. Part No.B25161C0050M000
BrandEPCOS
kr 4 033,80
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. 136-6325
Mfr. Part No.B25675A4252J015
BrandEPCOS
kr 1 192,05
Each
Units
415V ac 25kvar 30kvar - 3 x 154µF - Stud Mount MKK - - 192mm -40°C +60°C -5%
RS Stock No. 136-5121
Mfr. Part No.C9TS6MD6110AARX
BrandKEMET
kr 366,878
Each (In a Box of 12)
Units
440V ac - - - 3 x 110µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 136-5113
Mfr. Part No.C9TS5MD6123AARX
BrandKEMET
kr 559,542
Each (In a Box of 12)
Units
415V ac - - - 3 x 123µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 192-3577
Mfr. Part No.B32305A4332B080
BrandEPCOS
kr 1 926,245
Each (In a Box of 4)
Units
480V ac - - 3 152µF Polypropylene Stud Mount MKD - 136 Dia.mm 230mm -40°C +65°C -5%
RS Stock No. 187-5373
Mfr. Part No.PhMKP525.3.20,00-S84
BrandVishay
kr 1 403,528
Each (In a Box of 4)
Units
525V 20kvar - 3 3 x 77µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 192-3554
Mfr. Part No.B25161L0050O000
BrandEPCOS
kr 12 215,837
Each (In a Box of 10)
Units
12kV ac - - 3 500nF Polypropylene Stud Mount MV APP 470mm 115mm 600mm -25°C - -
RS Stock No. 135-3613
Mfr. Part No.PhMKP400.3.20,00-A84
BrandVishay
kr 1 246,25
Each
Units
400V dc - - - 3 x 132.6µF - Screw Mount phMKP - - 265mm - +65°C -