The PC series of current sensors are AC only current sensors that measure the RMS level of the sinusoidal current passing through the aperature.  These sensors offer a 4-20mA output level, and are loop powered for minimal connection requirements.  The measurement range of these sensors are adjustable by jumpers to reduced full scale range for precision reading of lower ranges.  These sensors provide electrical isolation between the circuit being measured and the output.  The PCS current sensors have clamping capabilities.