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. 136-4920
Mfr. Part No.B25675A4122J540
BrandEPCOS
TWD3,420.10
Each (In a Box of 9)
units
440V ac 12.5kvar 15kvar - 3 x 68.5µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 136-4911
Mfr. Part No.B25675A4052J000
BrandEPCOS
TWD2,698.00
Each (In a Box of 6)
units
400V ac 5kvar 6kvar - 3 x 33.2µF - Stud Mount MKK - - 164mm -40°C +60°C -5%
RS Stock No. 192-3552
Mfr. Part No.B25161L0025O000
BrandEPCOS
TWD30,977.90
Each (In a Box of 10)
units
12kV ac - - 3 250nF Polypropylene Stud Mount MV APP 470mm 115mm 500mm -25°C - -
RS Stock No. 136-4917
Mfr. Part No.B25675A4122J515
BrandEPCOS
TWD3,408.00
Each (In a Box of 9)
units
415V ac 12.5kvar 15kvar - 3 x 77µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 136-4915
Mfr. Part No.B25675A4302J000
BrandEPCOS
TWD5,521.80
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. 136-5139
Mfr. Part No.C9TS6MD5274AARX
BrandKEMET
TWD1,509.00
Each
units
440V ac - - - 3 x 27.4µF - Stud Mount C9T - - 160mm -25°C +55°C -5%
RS Stock No. 135-3603
Mfr. Part No.PhMKP660.3.22,90-A84
BrandVishay
TWD4,706.30
Each (In a Box of 4)
units
660V ac - - - 3 x 55.8µF - Screw Mount phMKP - - 340mm - +65°C -
RS Stock No. 136-4922
Mfr. Part No.B25675A4252J040
BrandEPCOS
TWD4,926.00
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. 136-5114
Mfr. Part No.C9TS5MD6154AARX
BrandKEMET
TWD2,507.00
Each (In a Box of 9)
units
415V ac - - - 3 x 154µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 187-5369
Mfr. Part No.PhMKP400.3.25,00-S84
BrandVishay
TWD10,718.50
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. 192-3567
Mfr. Part No.B25161T0025M000
BrandEPCOS
TWD45,474.00
Each (In a Box of 10)
units
40kV ac - - 1 250nF Polypropylene Stud Mount MV APP 350mm 120mm - -25°C - -
RS Stock No. 192-3540
Mfr. Part No.B25161C0025O000
BrandEPCOS
TWD29,687.20
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. 136-5129
Mfr. Part No.C9TS6MD6137AARX
BrandKEMET
TWD2,507.00
Each
units
440V ac - - - 3 x 137µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 136-4918
Mfr. Part No.B25675A4152J015
BrandEPCOS
TWD3,932.60
Each (In a Box of 9)
units
415V ac 15kvar 18kvar - 3 x 92.4µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 136-4912
Mfr. Part No.B25675A4122J500
BrandEPCOS
TWD2,627.10
Each (In a Box of 9)
units
400V ac 12.5kvar 15kvar - 3 x 82.9µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 136-4934
Mfr. Part No.B25669A5467J375
BrandEPCOS
TWD9,385.50
Each (In a Box of 2)
units
525V ac 40kvar 48kvar - 3 x 154µF - Stud Mount MKK - - 355mm -40°C +55°C -5%
RS Stock No. 136-4923
Mfr. Part No.B25675A4282J140
BrandEPCOS
TWD4,345.50
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. 136-5136
Mfr. Part No.C9TS5MD6108AARX
BrandKEMET
TWD2,089.00
Each
units
415V ac - - - 3 x 108µF - Stud Mount C9T - - 280mm -25°C +55°C -5%
RS Stock No. 136-4928
Mfr. Part No.B25675A4252J080
BrandEPCOS
TWD4,926.00
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. 135-3627
Mfr. Part No.GLI 900-150 A
BrandVishay
TWD5,316.00
Each
units
900V dc - - - 150µF - Plug In GLI - - 68mm -40°C +80°C -