- PolyPhaser
- Manufactures lightning and surge protection equipment. - Panamax
- Power protection products, offering a full line of surge protectors for home, office and against lightning damage. - Citel, Inc.
- Manufacturers of surge protection equipment suppressors for AC power lines, datacom, and telephone equipment. Also makes surge arrester gas tubes. - Surge-X
- Series mode surge protectors and power conditioners. - SatCon Technology Corporation
- Provides power and energy management products to the telecommunications, manufacturing, cable television and telephony, and aerospace industries. - Controlled Power Company
- Manufactures electrical power protection products, including uninterruptible power supply systems (UPS), emergency lighting inverters, and K-rated isolation transformers. - ZeroSurge
- Makers of commercial and consumer surge protectors. - Alltec Corporation
- Producing lightning and power protection technologies. - Sollatek
- Manufacturers of voltage protection and solar energy equipment. - MTL Instruments Group plc
- Produces electronic 'explosion protection' instruments, data aquisition products, electrical surge protection safety devices and gas analysis equipment. - Rabun Labs
- Provides lightning protection for home and industrial electronic equipment. - ENER/TECH, Inc.
- Manufactures the Redi-Volt II, a transient voltage surge suppressor. - Southland Power Protection
- Makers of Panamax surge protectors. - Advanced Protection Technologies
- Makers of transient voltage surge supression products. information for consultant engineers, contractors, and supply houses. - Brick Wall
- Surge suppression and electronic filtering/conditioning units designed for critical, non-fail protection applications. - Oryx Technology Corporation
- Technology licensing, investment, and management service company with a portfolio of surge protection products. - SL Waber
 - Control Concepts
- Offers surge protection and suppression products including active tracking filtering. - Detas
- Transient suppressors, and EMI/EMC power line filters. - Current Technology
 - MCG Surge Protection
- AC power line and data line protection for sensitive equipment; guards against damage from transients, lightning and surges. - ITW Linx
- Designs, engineers, and manufactures custom lightning and surge protection solutions for telecom, data, and AC equipment. - CITEL
- Specialises in surge voltage protection products. - TII Industries, Inc.
- Produces telephone network interface, surge protection, fibre optic and specialised electronic devices principally for use in the telecommunications industry. - Joslyn Electronic Systems Company
- Communication-protection products like anntenna arrestors, gas discharge tubes and other related devices. - STO.P Electronic Equipment Protectors
- Protects 12 volt electronic equipment on boats, yachts, and marine vessels from damage caused by spikes, transients, and overvoltages. - Centralion
- Offers stand-by and online UPS products. - Utility Systems Technologies
- Manufacturer of industrial electronic voltage regulators and stabilizers, electric power conditioners, and deep voltage sag protection - Surge Technologies
- Manufacturer of outside plant surge protection products for the telecommunications industry. - PowerKinetics
- Manufactures uninterruptible power supply systems (UPS) and accessories. - Ashley-Edison International
- Designs and supplies power protection systems, including AC automatic voltage regulators and stabilizers, AC power conditioning products, and uniterruptible power supply systems.
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