Question about Steffen Extension cable

Seems to be something new when you can specify an electrical power for a cable.
A cable only transports, but does not consume any power (=kW).
A cable is defined for which voltage (volts) and which maximum current (amperes) it is designed for. For this cable it is 3x 230/400V and 16A.

According to manufacturer max. 6.4Kw.
Rated current 16 A
Rated voltage 400 V
Rated frequency 50 - 60 Hz
Rated power 6400 W