The Schneider Electric C6347A570 is a MicroLogic 7.3 E AL electronic trip unit for the ComPacT NSX400...630 molded-case circuit breaker family. It's rated 570 A at 40 °C, 4-pole, and built for distribution duty on 50/60 Hz AC networks up to 440 V. The EN/IEC 60947-2 listing means it's certified for low-voltage switchgear and controlgear — the standard that governs MCCB coordination and short-circuit performance.
Protection and metering in one package
This unit packs LSI protection — long-time (L) overload, short-time (S) short-circuit, and instantaneous (I) short-circuit — plus integrated earth-leakage protection (Class A). The LCD display gives you energy metering, demand values, time-stamped event logs, and test reports.
Adjustable settings for selectivity
Long-time pickup (Ir) adjusts from 250 to 570 A; long-time delay (tr) is adjustable from 15 to 400 s at 1.5 x Ir. Short-time pickup (Isd) and delay (tsd) are also adjustable — tsd ranges 0 to 0.4 s with I²t on or off. Instantaneous pickup (Ii) is adjustable. Neutral protection can be set to 0.5 x Ir, 1 x Ir, or none, covering 3D + N/2, 4D, or 3D configurations.