The Model 276B Current Transformer is a ring-type current transformer for currents from 50 to 1200 amps. The Model 276B has an accuracy rating of plus or minus 2% for 50-100 amp CT’s, and plus or minus 1% over 100 amps at 60 Hz. This CT also features a 25-400 Hz frequency range, #8-32 secondary terminals and mounting brackets. Polarity markings are stamped on the transformer.