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. 136-4922
Mfr. Part No.B25675A4252J040
BrandEPCOS
kr 1 103,853
Each (In a Box of 4)
Units
440V ac 25kvar 30kvar - 3 x 137µF - Stud Mount MKK - - 192mm -40°C +60°C -5%
RS Stock No. 136-4923
Mfr. Part No.B25675A4282J140
BrandEPCOS
kr 1 167,388
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. 187-5377
Mfr. Part No.PhMKP400.3.12,50-S64
BrandVishay
kr 1 510,46
Each
Units
400V ac 12.5kvar - 3 3 x 82.9µF Polypropylene Stud Mount PhMKP - 67.6mm 265mm - +65°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. 192-3560
Mfr. Part No.B25161S0010M000
BrandEPCOS
kr 7 867,368
Each (In a Box of 10)
Units
36kV ac - - 1 100nF Polypropylene Stud Mount MV APP 250mm 120mm 760mm -25°C - -
RS Stock No. 187-5374
Mfr. Part No.PhMKP525.3.25,00-S84
BrandVishay
kr 2 325,328
Each (In a Box of 4)
Units
525V ac 25kvar - 3 3 x 96.2µF Polypropylene Stud Mount PhMKP - 88.2mm 265mm - +65°C -5%
RS Stock No. 135-3617
Mfr. Part No.HDMKP 1.1-420 I
BrandVishay
kr 1 555,72
Each
Units
1.1kV dc - - - 420µF - Plug In HDMKP - - - -40°C +80°C -
RS Stock No. 192-3574
Mfr. Part No.B32305A4282B140
BrandEPCOS
kr 1 657,325
Each (In a Box of 4)
Units
440V ac - - 3 154µF Polypropylene Stud Mount MKD - 136 Dia.mm 245mm -40°C +65°C -5%
RS Stock No. 192-3579
Mfr. Part No.B32305A5252B025
BrandEPCOS
kr 1 596,413
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. 136-6323
Mfr. Part No.B25675A4152J015
BrandEPCOS
kr 1 392,81
Each
Units
415V ac 15kvar 18kvar - 3 x 92.4µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 136-6319
Mfr. Part No.B25675A4052J015
BrandEPCOS
kr 739,97
Each
Units
415V ac 5kvar 6kvar - 3 x 30.8µF - Stud Mount MKK - - 164mm -40°C +60°C -5%
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. 136-5126
Mfr. Part No.C9TS6MD5960AARX
BrandKEMET
kr 564,30
Each
Units
440V ac - - - 3 x 96µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 136-6314
Mfr. Part No.B25669A5467J375
BrandEPCOS
kr 2 175,75
Each
Units
525V ac 40kvar 48kvar - 3 x 154µF - Stud Mount MKK - - 355mm -40°C +55°C -5%
RS Stock No. 192-3543
Mfr. Part No.B25161G0025M000
BrandEPCOS
kr 4 033,80
Each (In a Box of 10)
Units
7.2kV ac - - 1 250nF Polypropylene Stud Mount MV APP 175mm 115mm 340mm -25°C - -
RS Stock No. 192-3553
Mfr. Part No.B25161L0050M000
BrandEPCOS
kr 5 807,506
Each (In a Box of 10)
Units
12kV ac - - 1 500nF Polypropylene Stud Mount MV APP 343mm 115mm 425mm -25°C - -
RS Stock No. 136-5120
Mfr. Part No.C9TS6MD5960AARX
BrandKEMET
kr 528,875
Each (In a Box of 12)
Units
440V ac - - - 3 x 96µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 136-6307
Mfr. Part No.B25675A4122J500
BrandEPCOS
kr 510,67
Each
Units
400V ac 12.5kvar 15kvar - 3 x 82.9µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 135-3611
Mfr. Part No.GLI 1450-40 I
BrandVishay
kr 599,675
Each (In a Box of 4)
Units
1.45kV dc - - - 40µF - Plug In GLI - - 56mm -40°C +80°C -
RS Stock No. 192-3568
Mfr. Part No.B25161T0050M000
BrandEPCOS
kr 18 938,707
Each (In a Box of 10)
Units
40kV ac - - 1 500nF Polypropylene Stud Mount MV APP 350mm 185mm - -25°C - -