ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Mcb's used as functional switches?

Aussie240 is right. MCBs have only a fraction of the switching endurance of a light switch.

MCBs are only required by AS/NZS approvals testing to perform 1000 switching operations at full load, whereas light switches are required to do tens of thousands.

MCBs were never intended for control of a load, only isolation for servicing and overcurrent disconnection.