Did the thing same time screwed - see pictures above - to see what all have reingebaut.
The varistors are derived from the well-surge namely in the nanosecond range. It's okay.
The Blue varistors are designed for voltage 275V AC rms. The Yellow at 350 volts.
Problem is that with larger surges blowing the two 10A fuses, then the LED is no longer, and the varistors can not do any more work. The overvoltage protection is then to lay waste.
For a simple protection of overvoltage protection from Brennenstuhl is recommended. When the flash of course fully pure skin, which is rather improbable, the overvoltage protection is not suitable. You have to Greiff to solutions that cost a few hundred euros - much too expensive for home use - just for companies - such as servers and such.
Something else:
Not fall for the fallacy that unplugged devices do not get broken.
Equipment can also get broken, although that are not infected. If lightning strikes in a home he is usually derived through the lightning rod. Due to the very high currents, which also rise very steeply, formed a strong magnetic field, which in turn induce high voltages in conductor loops. In each unit there somewhere conductor loops. Various semiconductors do not like high voltages - result - unit breaks down.
