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surge current

   Also found in: Wikipedia 0.01 sec.
surge current [′sərj ‚kə·rənt]
(electricity)
A short-duration, high-amperage electric current wave that may sweep through an electrical network, as a power transmission network, when some portion of it is strongly influenced by the electrical activity of a thunderstorm.


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Metal oxide varistors limit the voltages to about three to four times the normal voltage of a circuit by diverting the surge current into other locations.
When an ESD pulse occurs, the diode protects delicate chips from the pulse energy by diverting the surge current to ground and clamping the voltage spike to a low level that the IC can safely tolerate.
The MOV is non linear device which allows large amounts of surge current to flow through it whilst maintaining a relatively small voltage across it.
 
 
 
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