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. 136-5113
Mfr. Part No.C9TS5MD6123AARX
BrandKEMET
SGD98.074
Each (In a Box of 12)
units
415V ac - - - 3 x 123µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 192-3552
Mfr. Part No.B25161L0025O000
BrandEPCOS
SGD1,426.077
Each (In a Box of 10)
units
12kV ac - - 3 250nF Polypropylene Stud Mount MV APP 470mm 115mm 500mm -25°C - -
RS Stock No. 136-5125
Mfr. Part No.C9TS6MD5830AARX
BrandKEMET
SGD97.92
Each
units
440V ac - - - 3 x 83µF - Stud Mount C9T - - 230mm -25°C +55°C -
RS Stock No. 136-4934
Mfr. Part No.B25669A5467J375
BrandEPCOS
SGD432.065
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. 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. 192-3548
Mfr. Part No.B25161L0010O001
BrandEPCOS
SGD1,426.077
Each (In a Box of 10)
units
12kV ac - - 3 100nF Polypropylene Stud Mount MV APP 470mm 115mm 400mm -25°C - -
RS Stock No. 136-4917
Mfr. Part No.B25675A4122J515
BrandEPCOS
SGD156.296
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. 192-3553
Mfr. Part No.B25161L0050M000
BrandEPCOS
SGD909.991
Each (In a Box of 10)
units
12kV ac - - 1 500nF Polypropylene Stud Mount MV APP 343mm 115mm 425mm -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. 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. 192-3565
Mfr. Part No.B25161T0012M000
BrandEPCOS
SGD1,825.899
Each (In a Box of 10)
units
40kV ac - - 1 125nF Polypropylene Stud Mount MV APP 250mm 120mm 945mm -25°C - -
RS Stock No. 136-5114
Mfr. Part No.C9TS5MD6154AARX
BrandKEMET
SGD114.87
Each (In a Box of 9)
units
415V ac - - - 3 x 154µF - Stud Mount C9T - - 280mm -25°C +55°C -
RS Stock No. 136-6310
Mfr. Part No.B25675A4152J000
BrandEPCOS
SGD187.21
Each
units
400V ac 15kvar 18kvar - 3 x 99.5µF - Stud Mount MKK - - 218mm -40°C +60°C -5%
RS Stock No. 192-3583
Mfr. Part No.B32305A8352B050
BrandEPCOS
SGD355.543
Each (In a Box of 4)
units
850V ac - - 3 51µF Polypropylene Stud Mount MKD - 136 Dia.mm 230mm -40°C +65°C -5%
RS Stock No. 136-4923
Mfr. Part No.B25675A4282J140
BrandEPCOS
SGD234.16
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. 187-5369
Mfr. Part No.PhMKP400.3.25,00-S84
BrandVishay
SGD498.365
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. 136-4931
Mfr. Part No.B25675A5122J525
BrandEPCOS
SGD146.356
Each (In a Box of 9)
units
525V ac 12.5kvar 15kvar - 3 x 48.1µF - Stud Mount MKK - - 200mm -40°C +60°C -5%
RS Stock No. 192-3555
Mfr. Part No.B25161P0010M000
BrandEPCOS
SGD863.049
Each (In a Box of 10)
units
18kV ac - - 1 100nF Polypropylene Stud Mount MV APP 250mm 115mm 425mm -25°C - -
RS Stock No. 135-3610
Mfr. Part No.GLI 900-150 A
BrandVishay
SGD196.485
Each (In a Box of 4)
units
900V dc - - - 150µF - Plug In GLI - - 68mm -40°C +80°C -
RS Stock No. 136-4922
Mfr. Part No.B25675A4252J040
BrandEPCOS
SGD226.77
Each (In a Box of 4)
units
440V ac 25kvar 30kvar - 3 x 137µF - Stud Mount MKK - - 192mm -40°C +60°C -5%