Did you reverse line and neutral on the terminals? It should be brass =black ,silver =white
This is a 240V plug, so both the white and the black are hot. Green is still ground.
That would be the original scheme for a three wire 240 volt device such as an ac unit, 240 volt water heater, electric drier, and electric range top( wire size however would be different for the loads)
The color scheme is also used in 110 volt ac systems( black= hot, white= neutral, and green= ground)
4 wire ac 240 would be black= leg1 hot, red = leg2 hot, white= neutral, and green/ bare= ground.
European colors are different.
As i recall ( if my memory is correct

)
Brown is leg1, white or grey is leg 2, and blue is neutral or earth.
But as i stated If my memory is correct, because it has been a long time.
Dc wiring schemes are a whole nuther animal when you add floating ground, signal, signal return, control voltage, etc.