The model UMV series are designed under micro base, and it also designed for general performance to accept ac input signals & convert AC to DC of average responding to scale RMS reading.
The unit type of ration input ranges are defined to accept a secondary signal from PT calibrated to primary reading & the named type of input ranges just directly follow inputs as a display reading.
The designed specifications of the units, truly a real power system design, compliant ANSI-IEEE & IEC, VDE those standards providing full protection for surge intrusion & unusual over input to assure reliable operation.
