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In message .com,
writes

The pictures I've seen of MCBs seem to just clip onto a support bar and
have a screw terminal at each side for wires. If they screw to a buss
bar I'd only expect to see one screw terminal for the output to the
ring or spur or whatever.

No, one of the screws is for fixing the MCB in place on the bus bar, and
presumably ensuring good electrical connection.
--
Chris French