ESR 20.3 is a measuring current transformer of the 4000 Series that allows you to measure the primary current in the system (from 50 to 250A) and bring it to a value of 5A or 1A suitable to be read by measuring instruments such as digital and analog indicators and ESAM transducers (ex. ID3004-TA, MI96C, MT-Ca, MT-C, MT-PA1 etc.). The ESR 20.3 transformer is the ideal solution for your system and guarantees an accuracy class of 1% or 3%, a FS5 safety factor and an insulation class E. The test voltage is 3kV for 1 ‘ and is built according to EN 60044 / 1-2, IEC 61869/1 + 2.