The coils are normally expected th be used in continuous service (ED 100%)
Is defined “Continuous Service” when the electrical connection time exceed ~1/4 of the time/temp. costant of the coil.
Careful consideration should be given to the connection time which should not be greater than 15′.
It’s possible for no continuous service (ex. ED50%) to use coil at power higher than indicated or at higher ambient temperature than the above mentioned.