Great question — answering as the UphillTech team:
I lost a AC Compressor control board, a landscape power supply (literally blew it apart), and some pool equipment. Not sure where the surge came from in this case. That sounds like a Fist Of God event. Given that you have a local transformer so 2400V crossing onto your 120V lines is unlikely,I'd say it was probably a lightning strike on your transformer or the distribution wires to it. Transformer insulation is only so good. Sending an SPD to fight lightning is like sending Hawkeye to fight Thanos. Slightly more useful is the modern Eaton multifunction xFCI breakers, which can detect overvoltage and undervoltage and trip for those. Far from a guarantee, though.
Full answer by Harper - Reinstate Monica: https://diy.stackexchange.com/a/273570 (CC BY-SA 4.0).
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