The C5 connector is intended for use all over the world. In Australia you can plug a regular domestic plug into a 32A socket. I haven't read Australian wiring regulations but I would presume they allow a 32A socket to be protected by at least a 32A breaker.
So it would appear to me that the designer of equipment with a C5 inlet, has to assume they may be facing upstream current protection of 32A and maybe higher.
I can't argue with your experiences, but that sounds pretty astonishing (unless you had duff fuses) - it takes at least 5A (1.15 kW at 230V) to blow a 3A BS1362 fuse.
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