Max power from surge protector
I suspect that Up should be written Up where U is the voltage rating and p is for "protection" or similar.

U is used to indicate voltage measurement most commonly in Germany. The intent is to avoid confusion with the "V" symbol and is more consistent with our use of I for current (amperes / A) and R or Z for resistance or impedance in ohms (&Omega;).

The protection rating only tells you the voltage at which it will clamp. It doesn't tell you how much power it can handle.

Note that 0.8KV would read as 0.8 kelvin-volts. It should have been written "0.8 kV". Capitals matter!