The Schneider Electric C16N42D160 is a ComPacT NSX160N moulded case circuit breaker rated 160 A at 40 °C, 4 poles, with a MicroLogic 2.2 electronic trip unit. It is designed for distribution applications and carries a 90 kA Icu breaking capacity at 240 V AC (50/60 Hz) per IEC 60947-2, stepping down to 50 kA at 415 V and 10 kA at 690 V. The N breaking capacity code means 50 kA at 415 V AC, which is the standard rating for this frame size in most panelboard and switchboard installations. It is electronic, not thermal-magnetic, so it holds calibration better across ambient temperature swings and offers a 20-minute thermal memory before and after tripping — meaning if a downstream fault clears and the breaker resets, the memory prevents immediate re-trip from residual heat, which is useful on motor-starting or welding circuits.
The 90 kA Icu at 240 V AC is the maximum interrupting rating; at typical 480 V industrial supply the breaker is rated 50 kA (per UL 60947-4-1) or 50 kA at 380/415 V AC per IEC. That is sufficient for most low-voltage distribution boards with a transformer impedance of 5–6% and a fault current under 50 kA. The utilisation category is A, meaning it is not intended for frequent switching of motor loads under load; use a contactor for that duty.
Neutral is on the left. IP40 front face; IK07 impact rating.