| AIM Europe: Manufactures active harmonic filters and electronic power factor correction equipment. |
| Beluk Power Factor Control from Illimite & the BLR series of PF control relays: Beluk.com is the home of information on Beluk Power Factor Controllers. Details on individual models and power factor correction theory are included. |
| Commonwealth Sprague Capacitor, Inc.: Manufacturer of low and medium voltage power factor correction capacitors, harmonic filters and motor run capacitors. |
| Cos Phi Inc.: Designers and manufacturers of power factor and power quality correction equipment for industry. |
| Electenergy Technologies Inc.: Energy saving and power conditioning system. |
| Enspec Power Ltd: Manufacturers of power factor correction equipment and harmonic filters. Specialists in power quality and high voltage engineering. |
| Hale Instruments Ltd.: Specialists in power factor capacitors, motor capacitors and obsolete electronic components. Based in Altrincham UK. |
| Mesta Electronics, Inc.: Digital power factor and harmonic managers. |
| MTE Corporation: Designer and manufacturer of line and load reactors, broad band harmonic filters and DC link chokes with information on products and technical articles. |
| Myron Zucker, Inc.: Manufacturers of power factor correction capacitors and harmonic filters. |
| Northeast Power Systems, Inc. (NEPSI): Manufactures custom-engineered power factor correction equipment and harmonic filters. |
| Phaseco, Inc.: Provides design, engineering, equipment and installation services for power factor correction capacitor and harmonic filter systems to the large industrial, commercial and manufacturing industries. |
| Phasetech Ltd: Power factor correction equipment. From UK. |
| Power Capacitors Ltd: Power factor correction equipment and single to three phase convertors. From UK. |
| Power Correction Systems, Inc.: Manufactures harmonic power correction filters. |
| RCCS: Distribution power factor correction and VAr/voltage control. |
| Steelman Industries: Electric power capacitors, capacitor cabinets and boxes also power factor correction capacitors. |
| Syscon: Manufacture of equipment that maintains the quality of power with information on products, client list and company profile. From India. |
| Yuhchang Electric Co., Ltd.: Manufacturer of power capacitor, automatic power factor regulator, series reactor and rechargeable lead calcium battery. From Taiwan. |
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