Class accuracy R (Railway) current measurement. DC, AC, pulse high accurate non-invasive measurements of currents up to 4000 ARMS with high galvanic isolation (isolation test voltage: 14 KVRMS / 50Hz / 1 min). Closed loop Fluxgate technology. Measuring range: up to 6000 ApK. Max overall accuracy: +/- 0.05 % of Ipn at +25°C. Class 0.5 R according to EN50463. Max overall accuracy (+23°C): +/- 0.2% of reading @ 10 % of Ipn, +/- 0.4% of reading @ 5 % of Ipn, +/- 2% of reading @ 1 % of Ipn. Power Supply: +/- 21.6 to +/- 26.4 V. Operating temperature range: -40 to +85°C. Analogue current output. Reduced size & low power losses. Really low current consumption. Current overload: 100kA/100ms. Fast response time: 0,1µs. Large bandwidth: up to 80 KHz (3dB). Low temperature drift of accuracy.