What it is and what it does
The C11N3TM032B is a Schneider Electric ComPacT NSXm circuit breaker — a 3-pole thermal-magnetic MCCB rated 32 A at 40 °C with a 50 kA interrupting capacity at 415 V AC. It is designed for distribution applications and complies with EN/IEC 60947-2, which governs the performance and safety of low-voltage switchgear and controlgear. The TM-D trip unit provides overload and short-circuit protection in a single, non-interchangeable package — no separate trip unit to order or install.
Key ratings and what they mean for fit
The 32 A rating at 40 °C is the continuous current the breaker carries without tripping under normal ambient conditions. Above that temperature, derating applies — the datasheet thermal curve governs the actual limit in a warm panel. The 50 kA at 415 V AC is the maximum prospective fault current it can safely interrupt; that SCCR (short-circuit current rating) determines whether the breaker coordinates with upstream protection or needs a current-limiting fuse ahead of it. Pollution degree 3 per IEC 60664-1 means the breaker is rated for industrial environments where conductive pollution or dry non-conductive pollution that becomes conductive due to condensation may occur. Overvoltage category III suits it for fixed installations downstream of the main distribution board — typical for branch-circuit protection in a panel. Rated for isolation per IEC 60947-2 — the breaker provides a visible break when open, so it can serve as a disconnecting means for the downstream circuit without a separate isolator.
Mounting and integration
Mounts on a backplate — not DIN-rail — so plan for screw-fixing or a busbar system. The 81 mm width (9 module pitches) and 137 mm height fit standard panel layouts. Front connections top and bottom accept compression lugs or busbars; the 35 mm connection pitch with spreaders (27 mm without) dictates the lug hole spacing for cable terminations. Mounts flat on the back in horizontal or vertical orientation — no derating for orientation is specified, but vertical mounting improves natural convection cooling in a sealed panel. The toggle control is front-accessible; the green flag signals auxiliary contact presence.