That would be a NEMA 14-30 which is the wrong plug type for the application, unless you needed 120 volt along with 240.I've forgotten the designation, but it is a four prong plug.
A NEMA 14-30 is a 4 Wire with an EGC. One of the 4 lines is the grounded circuit conductor (neutral conductor) which derives 120 volts. Only place you see them occasionally is something like a close dryer, where the motor and controls operate at 120 volts and the heating elements work on 240 volts.
For a 240 volt charger all you need is L1, L2, and G. Neutral serves no purpose.