Also correct, or four pole for a three-phase EVSE installation.
Many RCBOs aren't. An RCBO is an RCD as per the definitions.
That's obviously true. I imagine because of 'CU space considerations, most RCBOs have only SP switching (even though it probably would cost very little more to make the switching DP).
RCBOs aren't RCCBs. RCD is the umbrella term, but an RCCB does not have overcurrent protection so can be used to distinguish between RCCBs and RCBOs. That's why I tend to use the term RCCB to refer to those devices.
Indeed, but it's an umbrella term which simply means Residual Current Device, and Residual Current Circuit Breaker is not really very different from that.
Fair enough - but I think it remains the case that many (most?) people, including the greater majority of non-electricians call them "RCDs". I suppose one can'tr particularly blame them, given that the great majority of wholesalers and retailers also seem to use that terminology.
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