Double check your breaker -- physically, how big is it?
And what do you mean by rated? Is it rated to trip at 10,000 A (10 kA)? or is this the fault current it will operate without coming apart (the trip setting being actually much smaller).... read the label vary carefully...
Panelman: thanks, that's why I asked the question... I had assumed it was the smaller, but didn't understand exactly kbravo's intent -- thought I'd ask...
Imok2, it should be 5..10 times the current rating (C-characteristic, not D-characteristic. See also page 10 for the trip curve (upper left picture).
Good link imok2.