Single pole and switched neutral vs DP for EV

That particular  RCBO does disconnect the neutral, and would therefore meet 722.531.3.1.

However unlike a real dual pole RCD it has a strong sense of polarity, and the L N markings should  be respected. Presumably the MCB part senses on live only, and the switch  parts may not have the same arc traps on the neutral contact. From a safe isolation perspective, that's fine - its the gap once its open that matters.

However also be aware of confusion about devices advertised as 'SPSN' - it can be either  "Single pole, solid neutral" or 'Single pole switched neutral' at least in some older datasheets before the single module width sort with 2 moving contacts became popular.

To add water to troubled oil, some devices advertised as double pole or all pole also have a strong sense of L and N, especially on 3 phase, where N breaks late and makes early, relative to phases.

Mike.

I think you're OK with a switched N on systems where the "N" pole is earthed - what worries me more is seeing them in situations like caravans where the supply polarity isn't guaranteed (e.g. tow the caravan abroad and the supply may well be reversed or even 220V between two lines).

   - Andy.

true - thankfully  in the OPs case of a domestic EV charger, a sudden reversal of polarity is unlikely ;-) Actually there is then an argument for MCBs that do current sensing & breaking on both poles.

A related note, but on some kit we make that goes abroad we build in detection of L-N polarity, high impedance earth and in 3 phase, rotation sense as well as under and over-voltage lock-off . Its surprising how many wrong ways round there are for things to be wired when you leave the home installation.
M.

Dan20387 said:

Usually we fit 40A Type A DP RCBOs but at other installations I'm coming across these single SP+N RCBOs installed for domestic chargers.

The key difference with a true 2-pole RCBO is that the mcb function (overcurrent detection) is present for both poles, whereas with this device, the RCD function works for both poles (the sense coil is around L and N poles), but there is no mcb (overcurrent) function on the neutral pole, although it will disconnect the neutral for an overcurrent on the line pole.

The picture you posted is a unidirectional device, so it can't be used for V2G functionality.

With any switch or protective device with a neutral pole, especially three-phase, regardless of whether it is just switched, there may be a difference in the rated making and  breaking current of the neutral pole, as in three-phase it can be mechanically linked to make first and break last.