The LITTELFUSE SE-CS30-70 is a sensitive nickel-core current transformer from the SE-CS30 series, designed for detecting low levels of earth-leakage current when used with Littelfuse relays. Ideal for applications requiring precise ground-fault detection, this transformer offers a 70mm window size and a 600:1 turns ratio, ensuring reliable performance in metering and protection systems. It is CSA and UL certified and complies with IEC 60044-1.The LITTELFUSE SE-CS30-70 is a ground-fault current transformer with a 70mm window diameter. It operates within a frequency range of 50Hz to 400Hz and has a primary current rating of 30A, with a nominal secondary current of 50mA. This transformer features a 600:1 turns ratio and is classified as Accuracy Class 3. It is designed for chassis mounting with screw terminals and has an insulation level of 600V. The operating temperature range is from -55 to 60ºC.