Which is the diffenrence between "Primary nominal RMS current" and "Primary current, measuring range"?
I must choose a current transducer for meassure DC current and I don't know if it is enough to fulfill with "Primary current, measuring range" or if the current I must meassure must be lower than the "Primary nominal RMS current"

 

I think the "Primary nominal RMS current" should be within the "Primary current, measuring range". By definition the RMS value of a DC current is the the value of the DC current. They are only different for AC currents.