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They may have higher breaking capacity, but as MCB's breaking capacities is at least 6KA it is not a problem is it. I was really referring to wylex 3036 / 1361 type as there would be no RCD present (unless add on or an upfront... which is crap either way)
Not saying there is a problem with the breaking capacity of circuit breakers. But there is a lot to be said for fuses, e.g. for discrimination. (60898s in series won't discriminate.) And my installation with 1361s has RCD protection.