Check the listing for details. CR Magnetics CR4220 Loop-Powered AC 20A Current Transmitter Transducer. Condition: Used. Listed at 24.95 USD. CR Magnetics CR4220-20 Loop-Powered AC 20A Current Transmitter Transducer in very clean condition. From the CR Magnetics product page: The CR4220 Series, Loop-powered Current Transmitter produces a calibrated 4-20mAdc output signal that is proportional to the Average RMS input AC current. These devices provide long range monitoring of AC sinusoidal currents in an easy to install package. The output signal is generated from a user supplied PLC power supply within the output current loop. SpecificationsResponse Time: 250 msOutput Load: 0 To 300 ΩFrequency Range: 50 - 400 HzPower Source: Loop PoweredInsulation Voltage: 2500 VDCMTBF: Greater than 100 K hoursThermal Drift: 500 PPM/°CBasic Accuracy: 0.5%Calibration: Average Sensing, RMS Calibrated ApplicationsMulti-point current sensing and control panelsMonitor lighting elementsMonitor heating elementsRemote current sensingMonitor motor faultsGeneral purpose AC load monitoring