Patelec included in the UL plug range the following NEMA combinations:
NEMA 5-20 / 125V 20A plug model PC 520
NEMA 6-15 / 250V 15A plug model PC 615
NEMA 6-20 / 250V 20A plug model PC 620
These plugs are not as common as the standard NEMA 5-15 / 125V 15A (Patelec models 731- 738), but are used in certain applications where bigger appliances are involved, or for some professional/industrial applications (in particular for 6-15 and 6-20).
We faced some of these requirements as well from manufacturers of pumps and vending machines.
The new plugs are made in the same body, and differentiate for the direction of the blades.