The C164160D1S is a ComPacT NSX160NA DC PV switch disconnector from Schneider Electric, designed for photovoltaic DC circuits. It carries a DC-22A rating of 160 A at 1000 V DC, meaning it can safely make and break DC loads typical of PV combiners and inverters under load — the DC-22A utilisation category covers mixed resistive and inductive DC loads, which is what string-level switching sees. Four poles give you full isolation on both positive and negative conductors, and the 1000 V DC insulation voltage (Ui) matches the operational voltage (Ue), so the part doesn't derate on voltage when used as an isolator.
The headline number is 160 A at 1000 V DC in DC-22A duty. That's the current it can switch under load — not just carry. For a PV array, this covers the string current at the combiner output or inverter input. The conventional free-air thermal current (Ith) is 120 A at 65 °C, which is the continuous carry rating without switching; if your circuit only needs to carry current (no switching under load), that's the limit. Short-time withstand (Icw) is 2.5 kA for 1 second, and the making capacity (Icm) is also 2.5 kA — the switch can close onto a fault of that magnitude without welding. Impulse withstand (Uimp) is 8 kV, which is standard for 1000 V DC equipment in pollution degree 3 environments (conductive dust or condensation possible).
This is a fixed-mount switch disconnector on a backplate — not DIN-rail, so plan for a drilled panel or enclosure backplate. IK07 impact resistance handles light mechanical shock during installation. The toggle control gives a clear visual indication of contact position (the contact position indicator is built in), and the switch has no visible break — the toggle shows open/closed but you don't see the gap. That's fine for isolation: it's certified for isolation per EN/IEC 60947-3.