Switch disconnector for DC circuits — 500 A at 1500 V
The Schneider Electric C634500D3S is a ComPacT NSX630NA DC EP switch disconnector, 4 poles, fixed mount, rated 500 A at 1500 V DC. It's built for DC circuits — specifically photovoltaic arrays and marine DC distribution — where you need a positive disconnect with isolation capability per EN/IEC 60947-3. The 500 A rating is the thermal current (Ith) at 40 °C, which also matches the operational current in DC-22A and DC-PV2 categories, so no derating guesswork for those duty cycles.
Rated insulation voltage (Ui) is 1600 V DC — that's the voltage the insulation system is designed to withstand continuously. The operational voltage (Ue) is 1500 V DC, which is the circuit voltage it's rated to switch. Short-time withstand (Icw) is 7.56 kA for 1 second; that tells you the switch can hold closed under fault current for coordination studies. The rated impulse withstand (Uimp) is 8 kV, covering transient overvoltages common in PV strings.
Deployment context
Fixed mount on a backplate with front connections — both upside and downside connections are front-accessed, so panel wiring is straight-through. The 185 mm width and 255 mm height fit standard enclosure layouts; the 110 mm depth leaves room behind for cable routing. IP40 protection means it's for indoor panels, not washdown areas. IK07 impact rating handles accidental tool strikes during commissioning. Toggle control gives a clear visual contact-position indicator for safe isolation verification.