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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 ...
Also, when lightning struck our neighborhood, the surge protection saved my computer, modem and router." (Phew!) One homeowner pointed out that "this was an easy way to upgrade the outlets in our ...
A North American power strip with two USB power ports that includes a built in surge protector. A power strip (also known as a multi-socket, power board and many other variations [a]) is a block of electrical sockets that attaches to the end of a flexible cable (typically with a mains plug on the other end), allowing multiple electrical devices to be powered from a single electrical socket.
Inrush current, input surge current, or switch-on surge is the maximal instantaneous input current drawn by an electrical device when first turned on. Alternating-current electric motors and transformers may draw several times their normal full-load current when first energized, for a few cycles of the input waveform.
In consumer electronics, particularly surge protectors, the MOV varistor size employed is small enough that eventually failure is expected. [15] Other applications, such as power transmission, use VDRs of different construction in multiple configurations engineered for long life span. [16]
It necessitates the test of surge immunity in electrical or electronic equipment. IEC 61000-4-5 defines test set-up, procedures, and classification levels. In particular, it standardizes the required surge voltage and current waveforms for laboratory testing, with the "1.2/50-8/20 μs" impulse being the most frequently used surge waveform.