Honored Contributor
Honored ContributorI'm taking as granted, that you don't intend hot swap, insertion of boards with powered backplane. Under this assumption, I completely agree with Daixiwen "the only viable way is to fix the power supply". The power supply must have efficient means to strictly avoid overvoltages that are at risk to damage the connected equipment. We don't know however the energy involved with the surge. If it's low, TVS diodes at the boards may help. A "V"LDO ("very" low drop out voltage regulator, some have drop out voltages of 50 to 100 mV) can be an option, otherwise a special designed supply disconnector with a FET switch.
