EVSE-W16 has 2 integrated relays = 1 phase charger. First relay is for L1 and second one for N = up to ~3.6kW charging power
EVSE-W16 2phase charger = add 1 piece of this relay (e.g. Skoda Citygo-e up to ~7.4kW charging power)
EVSE-W16 3phase charger = 2 pieces of this relay (e.g. Tesla Model S up to ~11kW charging power)