The Schneider Electric C25S4D is a ComPacT NSX250S DC basic frame — a 4-pole, 250 A molded-case circuit breaker rated for DC distribution networks up to 750 V DC. It delivers 100 kA Icu breaking capacity across the full voltage range (250 V DC 1P through 750 V DC 3P), certified to EN/IEC 60947-2. This is the frame only; it ships without a trip unit, so you select the protection module (electronic or thermal-magnetic) separately to match the load's coordination curve.
For a 250 A frame on a 750 V DC bus, that SCCR headroom covers most industrial battery banks, UPS outputs, and DC traction supplies. The 10 ms maximum breaking time means the arc is quenched fast enough to limit let-through energy for downstream components. The IP40 front face and IK07 impact resistance handle panel-side handling and accidental tool contact, but the backplate mount and fixed design are meant for permanent installation, not portable gear.
Fixed backplate mount, front connection both top and bottom. The 140 mm width, 161 mm height, and 86 mm depth fit a standard MCCB footprint on a backplate or sub-panel. Neutral is on the left; the toggle control gives clear visual indication of the contact position.