What this MCCB is and what the ratings mean for fit
The C12N44V160B is a Schneider Electric ComPacT NSXm moulded-case circuit breaker (MCCB) in a 4-pole (4P) configuration, rated 160 A at 40 °C and designed for distribution duty on AC networks at 50/60 Hz. Its headline breaking capacity is 50 kA at 415 V AC — that is the maximum fault current it can safely interrupt without welding contacts or rupturing the case, which determines whether it can be placed upstream of a panel with a high available fault current. The electronic MicroLogic 4.1 trip unit provides adjustable overload and short-circuit protection with an integrated earth-leakage function selectable from 30 mA up to 5 A, covering both class A and class AC residual current types. That means this single device can serve as both a feeder breaker and a ground-fault protector, reducing component count in a distribution panelboard.
Compliance and documentation
The MCCB is certified to EN/IEC 60947-2, the standard for low-voltage switchgear and controlgear — specifically the circuit-breaker product standard. Pollution degree 3 per IEC 60664-1 means it is rated for a conductive environment (typical of industrial control panels), and overvoltage category IV suits it for main distribution boards at the service entrance. Operating altitude is 2000 m without derating; above that up to 5000 m requires derating per the manufacturer's curve. Relative humidity range is 0–95% non-condensing. The thermal memory function retains heat history for 20 minutes before and after tripping, preventing immediate reclosure on a hot overload — a detail that matters for motor feeder applications where repeated starts could otherwise nuisance-trip.