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A surge protection device mounted on a residential circuit breaker panel A varistor inside a consumer-grade surge protector has failed after a lightning strike. The Joule rating number defines how much energy a MOV-based surge protector can theoretically absorb in a single event, without failure. Better protectors exceed ratings of 1,000 joules ...
Prevent appliances and electronics from damage—and potentially extend their lifespans—with one of the best whole-house surge protectors on the market today.
Surge protection means spike protection from what would otherwise cause electrical damage. The average lightning strike is 20,000 amps and as large as 200,000 amps. Therefore a nominally sized protector is rated for 40,000 amps or higher which is about 1000 joules.
The power conditioner will also have a "joule" rating. A joule is a measurement of energy or heat required to sustain one watt for one second, known as a watt second. Since electrical surges are momentary spikes, the joule rating indicates how much electrical energy the suppressor can absorb at once before becoming damaged itself.
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Power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults [citation needed] through the disconnection of faulted parts from the rest of the electrical network. The objective of a protection scheme is to keep the power system stable by isolating only the components ...
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