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A small free-standing UPS
An uninterruptible power supply, or UPS, (sometimes called an 'uninterruptible power source ') is a device which maintains a continuous supply of electric power to connected equipment by supplying power from a battery when utility power is not available. A UPS is inserted between the source of power (typically commercial utility power) and the load which is to be protected. When a power failure or abnormality occurs, the UPS will effectively switch from utility power to battery power (see below for different UPS designs and how they actually work.) While they are not limited to any particular type of equipment, they are typically used to protect computers, telecommunication equipment, and any other electrical equipment where an unexpected power disruption could cause injuries or fatalities, serious business disruption or data loss. UPS units come in sizes ranging from units which will backup a single computer without monitor (around 200 VA) to units which will power entire data centers or buildings (several megawatts.) Larger UPS units typically work in conjunction with generators.

Historically, UPS units were very expensive and were most likely to be used on expensive computer systems and in areas where the power supply is interrupted frequently. However, UPS units are now more affordable, and have become an essential piece of equipment for data centers and business computers, but are also used for personal computers, entertainment systems and more.

In North America in particular, the electrical grid is under increasing strain particularly during heavy demand periods such as summer when air conditioning use is at its highest. In order to prevent blackouts, electrical utilities will, from time to time, use a process called load shedding. This reduces the amount of power being sent to the consumers but sometimes it does eliminate it entirely for an hour or so. This drop in voltage is also sometimes called a voltage sag or a brownout. A UPS will protect equipment from a brownout by using its internal batteries to correct the drop in voltage. The single biggest event that brought attention to the need for UPS power backup units was the 2003 North America blackout in the north-eastern US and eastern Canada.

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Advanced Power Technology - Distributor of APC power protection products. UK based.
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AEC - Manufactures uninterruptible power supplies, battery backup products, inverters, rectifiers and generators. Suppliers to the telecommunications, networking and other industries. Based in UK.
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Always On UPS Systems - Manufacturer of backup power and power quality products. This includes line interactive and online UPSs, PLC power and data protectors, TVSS filters and isolating line filters. Based in Canada.
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Uninterruptible Power Supplies Ltd - Manufacturers UPSs for computer applications.
Meta Description: [ UPS Power Systems - UK's Leading supplier of Uninterruptible Power Supplies (UPS) and other power back-ups including standby generators, battery banks, software & ancillaries. ]

Universal Power Systems, Inc. - Offers transportable and fixed site uninterruptible power supply systems.

XTE - Distributor of UPS and environmental monitoring products. Also offers installation and service. Based in Australia.
Meta Description: [ XTE specialises in the design, installation and service of Emergency Power Systems and Power Protection Systems. These systems include Automatic Emergency Generators, Uninterruptible Power Systems (UPS), Power Conditioning and Filtration, Power Factor Correction and Harmonic Conditioning Sytems. ... ]

Yutaka Electric Manufacturing Co, Ltd. (YEC) - Manufacturer of UPS and power supplies primarily serving commercial and oem markets, primarily in Japan. UPS product line features true online double conversion technology.
Meta Description: [ ユタカ電機製作所は創業50年の電源設計・製造メーカーです。主要製品は電源,トランス,無停電電源装置(UPS)など電源関連全般を取扱っております。電源でお困りの方は御相談承ります。 ]

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