The surge protector has an important parameter, 8/20us or 10/350us, which many people are unaware of. The main function of the surge protector is to respond to lightning strikes, including direct and induced lightning. The forms of direct lightning and inductive lightning have different energies, and their current waveforms are similar to 10/350us (direct lightning) and 8/20us (inductive lightning...

Quick Answer A Surge Protective Device (SPD) cannot be considered permanently effective simply because its indicator window remains green. The indicator only shows part of the device status. Actual protection performance also depends on installation quality, grounding conditions, upstream protection coordination, wiring length, and previous surge events. During lightning strikes, grid switching, o...