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Simon Nielsen This is a somewhat rare adapter that met our needs in a unique situation where we only had a NEMA 15-50 outlet available for EV charging. It has a high-quality construction and works well for our application.
NEMA 15-50 3-phase to NEMA 14-50R Adapter for EV only
$99.98
This adapter has a NEMA 15-50 plug which fits 50A 208V 3-phase outlets, and converts it to a standard NEMA 14-50 outlet for use with common EV charging stations. Note, this adapter has power and ground wired but no neutral - this is perfect for EV charging, but may not work for other applications that require a 120V neutral.