Luckily it was an MCB installation, that tripped fast enough to save the dimmer circuitry. If you had a Rewireable fuse instead, the dimmer circuitry may have been wrecked by the sudden current surge.
The person who fitted that was a dangerous idiot. You should probably assume that they have done other equally dangerous things elsewhere in your house. Get the whole place checked by a competent electrician ASAP.
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