Thermal overload protection (ANSI 50/51), running stall and jam protection, earth fault (50G) and short circuit protection along with selectable start attempt limitations (66) are features of the relay. A built in motor load current transducer is useful for indicating the % motor load through the 4-20mA loop.
Available in Amp calibration range from 0,8A to 1680A split over 320, 1, 2,3,4,5 Amperage selection bands. The 327M is the de-facto choice with motor full load current expressed as % calibration of the 1 amp or 5 amp secondary with the maximum load setting expressed as the M.F.L. current divided by the C.T. Ratio, multiplied by 100.