Alan D, over here... RCD = Residual Current Device, it senses an imbalance of current between the live and neutral, Eg: Live to earth current flow or neutral to earth current flow, above a certain imbalance (30 ma is common here) the device trips and cuts off the supply to downstream, it's resettable.
MCB = Minature Circuit Breaker, does the job of the old style fuses and is resettable.
RCBO = Residual Current Breaker with Overcurrent, does both of the above all in one minature unit.
There are other acronyms but those are the ones I'm most familiar with.
Lawrence. EDIT: I also used the term DNO ('s) that is the District Network Operator, responsible for low voltage power distribution in their prescribed area, there are are several DNO companies over here, our place is served by Western Power Distribution. The electricity supply companies are a different entity.
MCB = Minature Circuit Breaker, does the job of the old style fuses and is resettable.
RCBO = Residual Current Breaker with Overcurrent, does both of the above all in one minature unit.
There are other acronyms but those are the ones I'm most familiar with.
Lawrence. EDIT: I also used the term DNO ('s) that is the District Network Operator, responsible for low voltage power distribution in their prescribed area, there are are several DNO companies over here, our place is served by Western Power Distribution. The electricity supply companies are a different entity.
