What it is and what it does
The Schneider Electric C124160LS is a ComPacT NSXm 160NA switch disconnector, 4 poles, rated Ith 160 A at 40 °C. It is listed under the ComPacT range and built to EN/IEC 60947-1 and 60947-3, with a suitability-for-isolation mark (yes, per EN/IEC 60947-3). That means the open contacts provide a visible-break-equivalent isolation gap — the contact position indicator confirms the state without needing to open the panel. The utilisation categories tell you the load it can handle: AC-22 (160 A) covers resistive and mixed loads; AC-23 (100 A) covers motor and high-inrush loads. Both at 440 V and 690 V, with electrical endurance cycles listed per category. For a distribution disconnector, the AC-22 rating is the one that governs normal panel duty; the AC-23 figure is the limit for switching motor feeders.
Mounting and integration
Mounts fixed on a 35 mm symmetrical DIN rail or directly on a backplate. The 108 mm width and 137 mm height fit a standard panel cutout; the 27 mm connection pitch aligns with busbar systems. Terminals are EverLink lugs accepting 2.5…95 mm² rigid/stranded copper or 2.5…70 mm² flexible copper — no lug kit to order separately. IP40 front-of-panel protection and IK07 impact rating mean it handles the occasional tool bump in an enclosure but is not rated for washdown. Pollution degree 3 (IEC 60664-1) suits it for industrial atmospheres where conductive dust or condensation may occur.
Fault handling and coordination
Rated short-time withstand current Icw is 1500 A for 1 s and 3 s, and 335 A for 20 s — enough for selective coordination with downstream breakers in a distribution board. The short-circuit making capacity Icm is 2.13 kA for the switch-disconnector alone, or 150 kA with an upstream protection circuit breaker. That 150 kA figure tells you this part is designed to be backed by a current-limiting breaker; it is not a standalone fault-breaker. Rated impulse withstand voltage Uimp is 8 kV, insulation voltage Ui is 800 V AC. Class II double-insulation construction means no protective earth connection required on the device itself.