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This is a real no no ! manufacturers design consumer units to be compatible, and compliant with standards using their own mcbs. The performance characteristics and fit of mcbs vary between manufacturers. If a different manufacturers mcb is fitted, the installer then takes the responsibility...

Many domestic dimmers buzz to some extent. Dependant on the make/type this can sometimes be minimised by tightening the unused terminal screws. These can vibrate in the terminals, it does not always work but worth a try.