Single pole and switched neutral vs DP for EV

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.

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.