DIN-rail lightning strike counter

Yeah! Weird device that I've never come across before. I kinda want to fit one in my DB just for the gimmick value.
It's basically a digital counter with non-volatile memory, that detects high current pulses being shunted by a surge protector and gives a running score.

This could be used to monitor for when a new surge protection module was needed, but it is only designed to detect high current pulses, so won't show the accumulated small-transient shunting that can be caused by highly inductive loads in the vicinity.

Quite novel though, with sensible design and a stunningly low standby current of just 0.1W.

Given that the input is electrically isolated (on this particular unit), I wonder if it could have other event counting uses with a simple low voltage input.
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