Circuit breakers have a much bigger contact area for the mains supply to flow through giving NO restrictions to the current. If you picture electricity flow like water down a tube, a larger diameter pipe will flow better than a small one.
A fuse however consists of only a thin wire who's resistance builds up until it melts (breaks) at its rated value. So on a 13A fuse running on say a 8A load the resistance (inductance) will be quite high which sounds terrible!
One of the main points when dealing with mains supply to sound and vision equipment is to reduce as much as possible line inductance. Personally I do not use any fuses, except inside the equipment and use a 20A circuit breaker in the consumer unit. They also react much quicker to a line short out.
Have been on holiday so sorry about the delay in replying.
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