Yuhchang Electric Co., Ltd.
Manufacturer of power capacitor, automatic power factor regulator, series reactor and rechargeable lead calcium battery. From Taiwan.
http://www.capacitor.com.tw/

Power Capacitors Ltd
Power factor correction equipment and single to three phase converters. From UK.
http://www.powercapacitors.co.uk/

Mesta Electronics, Inc.
Digital power factor and harmonic managers.
http://www.mesta.com/

Northeast Power Systems, Inc. (NEPSI)
Manufactures custom-engineered power factor correction equipment and harmonic filters.
http://www.nepsi.com/

Commonwealth Sprague Capacitor, Inc.
Manufacturer of low and medium voltage power factor correction capacitors, harmonic filters and motor run capacitors.
http://www.comsprague.com/

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.
http://www.mtecorp.com/

RCCS
Distribution power factor correction and VAr/voltage control.
http://www.rccscontrols.com/

Electenergy Technologies Inc.
Energy saving and power conditioning system.
http://www.electroflow.com/

Phasetech Ltd
Power factor correction equipment. From UK.
http://www.phasetech.co.uk/

Myron Zucker, Inc.
Manufacturers of power factor correction capacitors and harmonic filters.
http://www.myronzuckerinc.com/

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.
http://www.phaseco.com/

Power Correction Systems, Inc.
Manufactures harmonic power correction filters.
http://www.activeharmonicfilters.com/

Cos Phi Inc.
Designers and manufacturers of power factor and power quality correction equipment for industry.
http://www.cosphi.com

Syscon
Manufacture of equipment that maintains the quality of power with information on products, client list and company profile. From India.
http://www.syconindia.com

Beluk
Details on individual models and power factor correction theory are included.
http://www.beluk.com

Hale Instruments Ltd.
Specialists in power factor capacitors, motor capacitors and obsolete electronic components. Based in Altrincham UK.
http://www.haleinst.co.uk

Enspec Power Ltd
Manufacturers of power factor correction equipment and harmonic filters. Specialists in power quality and high voltage engineering.
http://www.enspecpower.com

AIM Europe
Manufactures active harmonic filters and electronic power factor correction equipment.
http://www.aimeurope.com/