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Why would you choose electromechanical over electrical RCBO or vice versa? Hager, ABB and other manufacturers offer two types of RCBOs. I would like to know what are the pros and cons of each.

There is a 6mm2 aluminium cable connected with a 4mm2 copper cable in a radial configuration. They are both buried in masonry, their total length is ~10m. I cannot think of any correction factors (no thermal insulation, no increased ambient temp etc.). 1. Can I use a 32A MCB to power that...