The M100-AX1 and AX3 are essentially the same as the M100-AA1 and AA3, but they have auxiliaries which allows the working range to be 0-125% rather than 10-125%. Used where the average sensing of current is required from 0-125% of the nominal current.
Note the C.T.s must all have the same ratio or the output from the transducer will not be the sum of the total current in the system.