I am about to buy some MCB/RCD combo units for my distribution board. Domestic house with remote meter box. Cable between them is 80 amp and there is an 80 amp HRC service fuse in the meter box.
MCB/RCD combos seem to be fault current rated at either
1. 30,000 amp
2. 45,000 amp
3. 60,000 amp
Other than bigger is best: what rating do I need?
I know that I need 30 milliamp tripping C curve units but there also seem to be a choice of either electronic tripping or magnetic tripping. Does anyone have any opinion on which is "better".