The CCS Products CTS-2000-400 Split-Core Current Transformer, 400A, 2 in. Window features a removable section, so that it can be installed without interrupting the circuit. It has a rectangular window opening of 2″ x 2″ and offeres a rated current of 400A. The CTS series CTs do not require shorting blocks because they contain an internal secondary burden resistor, so there is no possibility of high voltage on the secondary. The internal burden resistor converts the secondary current (mA) into a safe 0.333 Vac output. CTS CTs are intended for energy monitoring with accuracies of 1% of reading from 10% to 130% of rated current.