Open loop current sensor RC120-30 is used together with the CSU-2LV current sensing unit and connected with RJ45 connector. The current sensor uses rogowski coil technology to measure current. The current sensor is specific for CSU-2LV with measurement output of 0,361 V/ kA. Coil diameter for bus bar or cable is 120 mm, transducer diameter is 12,4 mm and the cable length of 30 m. The open loop current sensor is assembled with a bayonet holder.