Whether it's called a surge, a sag, a spike, a transient or a fluctuation, "dirty power" is some type of abnormality in the electricity that runs your traffic signal cabinet. It can originate from an accident that has caused power lines to arc or a lightning strike. Surge suppressors provide protection from spikes by limiting let-through voltage that could destroy down-stream equipment in your cabinet.
In this week's MoboTrex Minute, Emerson Network Power covers the advancements in Surge Protection. PDF link corrected
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