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A surge protector is an appliance designed to protect electrical devices from power surges and voltage spikes. Surge protectors attempt to regulate the voltage supplied to an electric device by either blocking or shorting to ground voltage above a safe threshold.

Surge protectors can be built with one or more of the following electronic components:

  • A fuse burns out or a circuit breaker trips when excessive power is being consumed and fed to a device within the designed time lag and current rating. These can protect both from surges caused by the device itself and from external surges that last long enough.
  • An iron poor transformer can transmit AC power similar to a normal iron core transformer (although less efficiently), but will be unable to transmit sudden surges that saturate the small iron core.
  • A metal oxide varistor (MOV) is a small device that will short when presented with a voltage above its rated "clamping voltage", passing the surge to ground through the MOV rather than through the protected device, provided the current rating (joule) is not exceeded. If the surge exceeds the joule rating, the MOV will be destroyed. Even if not destroyed, MOVs also deteriorate each time they receive a voltage spike, and thus stop working after some time. Some surge protectors have a light to tell you when this stage has been reached.
  • A zener diode is a small diode designed to protect against normal spikes in a circuit, especially motor controller circuits. These are sometimes paired as a transient voltage suppression diode.
  • A gas discharge tube is used much like a MOV, except that it relies on a trapped gas to become ionized to pass the voltage. This has the advantage of being able to pass much more power without self destructing, but with the disadvantage of reacting to the high voltage more slowly.
  • Devices having several outlets with surge protectors described may have all or some outlets protected. The better ones have higher ratings and offer more modes of protection against surges between the phase and neutral and grounding conductors; maybe for telephone and coax cable connections. (The best have insurance policies paying for damages from surges.)
  • An UPS of the flywheel type seldom pass surges. The battery variety may absorb spikes much like a capacitor acts as a low pass filter. The battery ones also have protectors described above. "On line" UPSs provide the best protection.
  • Series Mode surge protectors use a "surge reactor", which has the advantage of being extremely quick to react to surges and which does not generally deteriorate over time.

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Accessories, Inc. - Manufacturers gas-tube and quarter-wave coaxial surge arrestors, RF splitters for ISM and UNII wireless LAN, PCS, MMDS and cellular.
Meta Description: [ Lightning protector, surge arrestor offering power surge protection and surge suppressor using gas discharge tube suppression. Lightning surge protector, arrestor & suppressor protection. ]

AC Data Systems - Manufactures modular transient voltage surge suppression (TVSS) devices.

Advance Surge Suppressor - Manufacture transient surge suppressors, protectors, arrestors and power line conditioners.
Meta Description: [ transient surge suppressor, surge protector, surge arrestor arresters are devices which tipically protect electronic equipment from damage caused by transient voltage and surge currents ]

Advanced Electronics - Manufacturer of surge protection for industrial, commercial and residential electrical service.
Meta Description: [ Manufacturer of Clean Power® surge protection for industrial, commercial and residential electrical service. ]

Advanced Lightning Technology - Manufacturers of grounding and lightning protection equipment.
Meta Description: [ ALT Manufacturing, specializing in tower and grounding components ]

Ahoku Electronic Company - Manufacturer of surge protectors, emi/rfi filters, travel converters, and fiber optic communication components. From Japan.

All South Lightning Protection, Inc. - Lightning protection and surge suppression.

Alltec Corporation - Manufacturer of lightning protection and grounding systems. USA.
Meta Description: [ Alltec Corporation is a manufacturer of lightning protection and grounding systems. ]

Atlantic Scientific - Industrial surge protection and suppressors for wireless, tvss, networks, home, loadcenters.
Meta Description: [ Specializing in effective surge protection for the telecommunications, network and wireless industries. ]

Automatic Lightning Protection - Lightning Rods and information. Do it yourself lightning protection.
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Circuit Components Inc. - Manufacturer of industrial grade line filtering, surge suppression, and surge protection devices for incoming power services, field and control room equipment.

Citel - Manufacturer of surge protection equipment suppressors for AC power lines, datacom and telephone equipment. Surge arrester gas tubes protect against lightning surges and electrical transients.
Meta Description: [ We have a wide range of power protectors
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Clean Volt - Manufacturer of residential and commercial lightning arrestors.
Meta Description: [ Clean Volt protects everything electrical.Clean Volt will increase the life by up to 32%, and will save up to 20% of your power consumption. Total residential, industrial and commercial protection ]

Clearline - South African manufacturer of lightning and surge protection devices for office, home and factories.
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Comm-Omni International - Lightning and transient surge protection products, filters and technical information including grounding. Free applications consulting.

Delta Lightning Arrestors - Some good information on lightning arrestors.

Ditek Corp. - Manufacturing surge protectors with on line catalog and shopping cart.
Meta Description: [ Ditek surge protectors ... provide quality surge protection for the most demanding environments. Buy surge protectors online for all residential and commercial surge protection applications including Fire, CCTV, HVAC, CAT 5, KSU, PBX, T1 ... ]

Eclips Professional Technical Systems - A major designer, manufacturer, and consulting experts in the field of TVSS (transient voltage surge suppression)

Elec-Saver Corporation - Manufacturers of transient voltage surge suppressor.
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Electronic Specialists, Inc. - Manufactures protectors and interference filters for computers, modems, video, audio and industrial equipment.
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500 Elpro International ltd. - Manufacture of surge arresters zinc oxide discs - surge arrester component, metal oxide varistors, isolators (disconnecting switches), alnico magnets both cast and sintered.

Ener/Tech - High performance electronic device which prevents damaging transient voltages from reaching and harming any electrical equipment.
Meta Description: [ RediVoltTM provides a written guarantee of energy savings on you electrical equipment. ]

Exothermic Welding - Manufacturer and exporter, from Thailand, of exothermic-welding materials (metal powder and graphite molds) for making electrical connections as in earthing (grounding) and lightning protection.
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General Telecom, Inc. - Manufacturer of grounding equipment and wire screen partitions for the telecommunications industry.
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Harger Lightning Protection - Full line supplier of lightning protection and grounding equipment for the communications and electrical industries.
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Heary Bros. - Engineers, designers and manufacturers of lightning protection systems for buildings, factories and homes worldwide.
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Innovative Technology, Inc. - Manufacturer of transient voltage surge suppression equipment.
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500 Intermatic Inc. - Offering surge protection equipment.

500 International Thunderbolt Technology Limited - A Hong Kong based company specialized in design and manufacturing surge protective devices.

ITW Linx - Manufacturer of power and lightning surge protectors, plus engineering and manufacturing of custom, modular surge protectors for AC, telecom, data and wireless applications.
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ITW Linx - Power and lightning modular surge protectors for telecom, data and AC equipment. Product specifications, articles related to surge protection, and list of distributors. USA.
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Keeg International - Multi dimensional company in electronic manufacturing, lightning protection, power management and power supplies.
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Kitagawa Electronics Pte Ltd - Manufacture a comprehensive range of EMI/RFI suppressors, ferrites, shielding materials and electronic components.

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LEA International - Manufacturer of surge suppressors for commercial, industrial, broadcasting, and medical imaging applications. Searchable product database with PDF datasheets and representative contact information.

Lightning Experts - Provides static, surge and lightning protection for towers and high voltage applications.
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Lightning Technologies, Inc. - Provides lightning protection design, engineering and testing for advanced electrical, electronic and structural systems and facilities.
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Magney Grande Distribution - Specializing in transient voltage surge suppression, power quality, and engineering consultation for naval shipboard, air station, oil production and drilling, and general industrial applications.
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Maida Development Company - Manufacturers of zinc oxide varistors, multi-layer varistors, PTC and NTC thermisitors, and ceramic disk capacitors.
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Meter-Treater, Inc. - Manufacturer of surge protective devices meter-based surge suppressor for residential, commercial applications as well as for signal, data and telephone interfaces.
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MTL Surge Technologies - Manufacturers of industrial surge protection for networks, wireless, tvss and home entertainment.
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Northern Technologies, Inc. - Manufacture and offers surge protection and UPS devices for AC and DC, coaxial, telco and dataline electronic equipment.
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Panamax - Online shopping site for Panamax surge protectors.
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Psytronics, Inc. - Specialist in transient voltage surge suppressors, surge protectors and uninterruptable power supplies.
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Rabun Labs - Lightning protection systems for electronic equipment.

Sankosha Corporation - Manufacturer of gas discharge tubes for surge protection with an online catalog of these protectors.
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Sollatek - Manufacture of surge, lightning and voltage protection.
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Southland Power Protection - Surge and lightning protectors for all types of electronics computers and home entertainment systems, online shopping.

Stormin Protection Products Inc., - Surge suppression equipment and information.

Surge-Solutions Limited - A provider of surge and lightning protection equipment.

Surge-X - Powerline surge suppressors, 110 and 220 v service models up to 20 amps.
Meta Description: [ Professional surge protectors and AC power conditioners - whole room power conditioning and surge suppression from the World Leader in Power Conditioning Technology ]

Surgetech Ltd - Designers and manufacturers of surge protection components, voltage supressors, thermistors, and other components. UK.
Meta Description: [ Surge Arresters, Over Voltage Protection and Surge Protection Solutions from Surgetech Ltd. For all your Surge requirements visit our site. ]

Ta Wei Electric Works Co., Ltd. - Taiwan manufacturer of lightning arrester, isolators, armored rods, and grips for power distribution and transmission systems.

Tesco-Online - Manufactures surge and lightning protection equipment for protection for A/C power and communication systems.

Thor Lightning Protection Ltd - Design, installation and testing of lightning and earthing systems.
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404 TopCan International Pte Ltd - Manufacturer of SLE lightning protection air-terminals and surge protectors.

Transtector Systems - Manufacturer of surge protectors. Product datasheets in PDF.

Tytewadd - Manufactures secondary surge and lightning arresters.
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United Power - Surge suppression for electrical panels from 240 single phase to 480 three phase.

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Meta Description: [ Volt Guard has developed over 200 models of surge suppressors and surge protection for a variety of electronic compenents and computer items. ]

Voltex Electronics Ltd - Manufacturers of surge protection and filter units. Includes an online catalogue and FAQs.
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W.J. Furse and Co. Ltd. - Lightning protection products.
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WALLIS Technologies - Manufacturer of surge protection for all IT and electronic equipment.
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Xian Amtech High Voltage Equipments Co., Ltd. - production of zinc oxide circular disc varistors and surge arresters with either silicone rubber casing (housing) or porcelain casing (housing). From China.
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Zero Surge - Manufacturer of surge suppression equipment.

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