The Schneider Electric C254250D3S is a ComPacT NSX DC EP switch disconnector rated for 250 A DC at 1500 V DC, built to EN/IEC 60947-1 and 60947-3. It carries DC-22A and DC-PV2 utilisation categories, so it is sized for photovoltaic combiner boxes and marine DC distribution where the full 1500 V rail must be isolated under load. Four poles in a fixed backplate-mount package, 161 mm tall by 140 mm wide by 86 mm deep. The toggle actuator gives a positive contact-position indicator — no visible break, but the isolation suitability per EN/IEC 60947-3 is confirmed, so you get a guaranteed open gap without needing to look inside the enclosure.
Rated 250 A at 1500 V DC in DC-22A and DC-PV2 categories. Rated insulation voltage is 1600 V DC, and the impulse withstand is 8 kV. For a 1500 V DC system, that gives headroom for switching transients and lightning-induced surges without flashover. Short-time withstand current is 3.5 kA for 1 second; the switch-disconnector alone can make onto a 3.5 kA short-circuit. In a PV combiner or battery bank, that covers the fault current contribution of a single string — but you still need upstream fusing or a DC breaker for the aggregate array fault level.
Environmental and mechanical margins
That covers the thermal extremes of an outdoor PV combiner enclosure in direct sun or a marine engine room. IP40 enclosure protection keeps out tools and debris; IK07 impact resistance handles accidental hammer blows during installation. Electrical durability is 4500 cycles at full rated current and voltage; mechanical durability is 10,000 cycles. For a switch-disconnector that sees daily string isolation and reconnection, that cycle life is adequate for a decade-plus of operation — not a maintenance-free device, but one where the contact wear is predictable.