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Blown varistors - Printable Version

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Blown varistors - on4cvl - 24.12.2018

Hello, 
I have a smartpi that has been operating successfully since april 2018 but yesterday 2 of the 3 varistors have blown up with as result that the main switch of the grid input also tripped.
(I have put a link to some pictures)

Is it possible to get the schematic of the voltage input circuit?
I would like to investigate the possible cause of this failure.

Regards,

Lieven

blown varistors