A power surge is a sharp increase in voltage.
Even though you’re on guard whenever there’s a lighting storm nearby, that’s not the most common cause of power surges; 80% of power disturbance are low-level and occur from within a building due to the normal operation of equipment.
According to a 1993 Florida Power study, on average, business equipment is hit by 50 surges per month.
30% – 40% of all business downtime stems from power quality problems1. Downtime is costly, the median cost for an SMB is $12,500 per day2.
1 Electric Light and Power Magazine
2 Symantec
No. The solution to fully protecting a server requires a combination of equipment. UPS devices should be a key consideration to protect servers from power outages and to insure a proper shutdown sequence. A UPS, however, will not provide adequate protection against surges, spikes, and high frequency noise. Businesses are faced with many choices for surge protection and are provided with a false sense of security when they purchase a UPS
Surges often go unnoticed, frequently lasting only 1/120th of a second, but they are much more common and destructive than you might think. Low-level surges, often called “electronic rust”, occur regularly and can cause stress on the circuits of your sensitive electronics, leading to early failure. High-level surges can result in immediate destruction of expensive equipment and circuitry
Electronic rust is the decay or weakening of electronic components due to the cumulative effect of unseen low level energy surges over time.
No, but they can wear away at sensitive equipment. An electronic device that may be designed to last for 15 years may only last 8 years or less if it is constantly hit with low-level surges.
Alternating Current. The voltage varies constantly above and below zero in a 50 or 60 Hertz sine-wave. Used for power distribution because the voltage can easily be changed by a transformer.

Ampere (or Amp): The unit of electric current. An analogy would be the amount of water going over a waterfall.

Avalanche Diode: A type of semiconductor component that is normally open circuit until the voltage increases to the point where the device turns on and conducts current. Similar in operation to MOVs but do not degrade with use. Very reliable as long as they are used strictly within their ratings.

Brown out: A sustained under-voltage condition which is low enough to cause equipment malfunction. Most equipment can operate from 105V to 135V without serious performance degradation. A voltage lower than 90V will usually cause functional problems.

Capacitance: The effect where electric charge is stored. A capacitor is an electronic component made specifically to store electric charge. Capacitors are also used to differentiate between frequencies in applications such as crossover networks. A capacitor has high impedance at low frequencies (open circuit at DC) and its impedance decreases as frequency increases.

DC: Direct Current. The voltage is constant and does not vary. Used primarily inside electronic equipment.

EMI: Electromagnetic Interference. A general type of electric, radio or magnetic interference which is transmitted by conduction or radiation and can be of a very wide frequency range.

Hertz: The unit of frequency in cycles per second. Used to characterize anything from AC power (50 or 60 Hertz) up to cellular phone radio frequencies (Giga-Hertz)

Inductance: The effect where energy is stored in a magnetic field. An inductor is an electronic component made specifically to store energy by using a magnetic field. Inductors are also used to differentiate between frequencies in applications such as crossover networks. An inductor has low impedance at low frequencies (short circuit at DC) and its impedance increases as frequency increases.

Inrush:  The initial current that occurs when a motor or electronic equipment is first turned on. The inrush current is usually several times higher than the normal operating current. In the case of electronic equipment the initial inrush current occurs while the power supply charges up. Equipment with a large current draw can have an inrush current large enough to blow a circuit breaker or damage switches and relays.

Joule: The unit of energy (measured over time). One Joule is equivalent to the heat generated during one second when one Volt is driving one Amp around a circuit.

MOV: Metal Oxide Varistor. A disc shaped device which is normally open circuit until the voltage increases to the point where the MOV turns on and conducts current. Originally developed to suppress arcing on relay contacts but used extensively in shunt-mode surge protectors. Have a limited lifetime.

Parallel: Devices connected together so that the same voltage appears across all devices.

Power Surge or Voltage Surge: A short term over-voltage condition. Surges caused by lightning are very high power but extremely short in duration, lasting only for 20 to 50 millionths of a second. Surges caused by equipment switching and other sources are also extremely short lasting typically for less than a thousandth of a second.

RF interference: Radio Frequency Interference. Interference which is caused by radio signals.

Series: Devices connected together in a chain so that the same electric current passes through all devices.

Series Mode®: A brand of surge protector which uses a high-voltage device to prevent surges and transients from being passed to connected equipment.

Shunt Mode: A type of surge protector which uses MOVs, avalanche diodes or gas discharge tubes to conduct surge current to the neutral or ground wire.

Switch-mode power supply: The power supply inside electronic equipment converts the 120V AC to the DC required by the circuitry. A switch mode supply is smaller and lighter than a traditional power supply because it switches the current on and off very fast to generate the DC using a small high-frequency transformer rather than a larger traditional power transformer.

Toroidal Transformer: A transformer that is constructed around a ring of iron. This produces a more efficient, compact design with a tighter magnetic field.

Transient or Spike: Similar to a voltage surge in that they cause a very brief over-voltage condition, but are typically less energetic and less damaging.

Volt: The unit of electric potential. Voltage drives electric charge around a circuit. An analogy would be the height of a waterfall.

Voltage Regulation: A means of maintaining the equipment voltage at a constant level. Domestic AC power is distributed at a nominal 120V but this can vary depending on the load and other factors in the distribution. A voltage regulator adjusts for those variations to provide a constant 120V at the equipment.

Watt: The unit of power (continuously generated). One Watt is generated when one Volt is driving one Amp around a circuit.

Argentina 220 50
Australia 240 50
Austria 230 50
Bahamas 120 60
Belgium 230 50
Bermuda 120 60
Brazil 110 – 127, 220 60
Bulgaria 220 50
Cambodia 120, 220 50
Canada 120 60
Chile 220 50
China 220 50
Colombia 110, 220 60
Costa Rica 120 60
Denmark 230 50
Ecuador 120 60
Egypt 220 50
El Salvador 115 60
England 240 50
Finland 230 50
France 230 50
Germany 230 50
Greece 230 50
Hong Kong 200 50
Hungary 220 50
Iceland 220 50
India 220 – 250 50
Iran 220 50
Iraq 220 50
Ireland, Southern 220 50
Ireland, Northern 220 50
Israel 230 50
Italy 230 50
Jamaica 110 50
Japan 100 50
Jordan 220 50
Kenya 240 50
Korea, South 110, 220 50
Kuwait 240 50
Mexico 127 60
Netherlands 230 50
New Zealand 230 50
Norway 230 50
Philippines 110 – 115 60
Poland 220 50
Portugal 230 50
Puerto Rico 120 60
Russia 220 50
Saudi Arabia 127, 220 50 / 60
Scotland 240 50
Singapore 230 50
South Africa 220 – 250 50
Spain 230 50
Sudan 240 50
Sweden 230 50
Switzerland 230 50
Taiwan 110 60
Thailand 220 50
Turkey 220 50
United States 120 60
Venezuela 120 60
Vietnam 220 50
Virgin Islands 120 60