What's a multi-stage hybrid in a communications or data surge protector?

All surge protectors are designed to minimize the let-through voltage to the equipment being protected, however, with all surge components the LTV increases with the amount of current in the surge. On low voltage circuits such as multiplexed communications and data, with logic levels of The last stage, therefore, only has to handle the maximum output of the previous stage. In this way, a single product incorporating multi-stages can control the LTV precisely irrespective of the current in the surge.

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