Hi-Tech Fuses, Inc.
Manufacturer of high-voltage current-limiting fuses, including backup and full-range types, for protecting electrical distribution equipment.
http://www.hi-techfuses.com/

High Voltage Connection
Sales representative for high voltage power supplies and other high voltage products. Includes technical articles on high voltage.
http://www.highvoltageconnection.com

Pudenz.
Littelfuse is the world leader in circuit protection offering Automotive Fuses, Automotive Circuit Protection, Fuses, Electrical Fuses, Thyristors and more.
http://www.pudenz.com/

Fusegear Electric Ltd.
An iso company producing low and high voltage fusegear and switchgear, high tension fuses, vcb, load break switches for all applications.
http://www.fusegearelectric.com/

Peco Industries
Manufacturer and exporter of low voltage switchgear and fuses such as overload relay, DOL, SASD and FASD motor starters, contactors or HRC fuses. Based in India.
http://www.pecoindustries.com

What is High Voltage
eeProductCenter delivers a full spectrum of critical design information about the latest ICs and electronic components for engineers facing challenging, design-in decisions. eeProductCenter continuously reports new product news with analysis and insight to help you make more informed product/technology decisions.
http://www.chipcenter.com/circuitcellar/november99/c119r16.htm

High Voltage Concepts
Designs and manufactures high voltage power supplies and high voltage diagnostic equipment, including general purpose supplies, x-ray power supplies and high voltage dividers.
http://www.hvconcepts.com/

High Voltage Information
High voltage reference information, including articles, books and relevant links. Also included is a buying guide for high voltage parts, instruments and services.
http://www.highvoltageinfo.com/

Chaos Labs High Voltage Projects
High voltage projects including ignition coil driver, high voltage transformers, and a 60 kV pulse generator.
http://members.tripod.com/hvprojects/highvoltage/

Wujin Zhenhui Electronic Co.,Ltd.
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http://www.chinafuse.com