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40amp, 30mA, 3 pole, RCCB for an EV charger ?

When selecting an RCCB for an EV charger you must use the RCCB type that is specified by the manufacturer; Type Si or Type B. Schneider Electric EV chargers recommend type Si protection.
In type B we currently only have 4 pole options, although these can wired and operate as single phase.

Type Si: A9R91440

Type B: 16752
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