The Schneider Electric C40F3 is a ComPacT NSX400F basic frame — a 3-pole, 400 A frame-size molded-case circuit breaker intended for distribution duty. It ships without a trip unit, so you add the appropriate electronic or thermal-magnetic trip module to match your load's protection curve. The 36 kA breaking capacity at 415 V AC (Icu per IEC 60947-2) means it can safely interrupt fault currents up to that level without welding or rupturing, which is the figure you'll use for panel SCCR coordination at typical 400 V-class industrial voltages. The 85 kA at 240 V AC per UL 508 gives you headroom for 240 V distribution panels where fault current can run high, common in North American commercial and light industrial installations.
Fixed-mount on a backplate, 140 mm wide × 255 mm high × 110 mm deep. Front connections top and bottom, with a 45 mm connection pitch that matches standard busbar and cable lug spacing. Toggle handle for manual switching and trip indication. IK07 impact rating handles the occasional tool bump during commissioning.