What the ratings mean for fit
The C124160BS is a Schneider Electric ComPacT NSXm 160NA switch disconnector, 4 poles, rated for isolation per EN/IEC 60947-3. The headline rating is 160 A conventional free-air thermal current (Ith) at 40 °C, which is the continuous current the device can carry in open air without exceeding temperature rise limits. For motor switching (AC-23 duty), the rated operational current drops to 100 A at 440 V AC — the AC-23 category covers switching of motors and other highly inductive loads, so if this part is feeding a motor starter, the 100 A figure governs, not the 160 A thermal rating. For mixed resistive-inductive loads (AC-22), it carries the full 160 A. The short-circuit making capacity (Icm) is 2.13 kA for the switch-disconnector alone, but rises to 150 kA when installed with an upstream circuit breaker — that coordination is critical for panel selectivity studies. The rated short-time withstand current (Icw) is 1500 A for 1 s or 3 s, and 335 A for 20 s, which defines how long the device can carry fault current while the upstream protection clears.
Mounting and panel integration
Mounts on a 35 mm symmetrical DIN rail or directly to a backplate. The fixed-mount form factor and 108 mm width mean it occupies four standard 27 mm pole pitches. Terminals accept crimp lugs from 2.5 to 120 mm² for rigid or stranded aluminium/copper, or 2.5 to 95 mm² for flexible aluminium/copper bars — sized for the 160 A continuous rating. IP40 enclosure protection and IK07 impact resistance suit it for general-purpose panel installation where no washdown or dust ingress is expected. Pollution degree 3 per IEC 60664-1 means it's rated for conductive pollution environments typical of industrial control panels.