The C16M2TM125 is a Schneider Electric ComPacT NSX160M molded-case circuit breaker, 2-pole, with a fixed TM-D thermal-magnetic trip unit rated 125 A at 40 °C. It carries a 25 kA Icu at 415 V AC (breaking capacity code M) and is certified to EN/IEC 60947-2 for distribution duty. The toggle control and front-front connections suit panel layouts where the breaker mounts flat on a backplate.
The 125 A rating at 40 °C is the continuous current the breaker handles without tripping in a 40 °C ambient — typical for a non-derated panel. Above that, the thermal element (L protection) follows the IEC 60947-2 trip curve for overloads. The magnetic element (I protection) handles short-circuits; the 25 kA Icu at 415 V AC means this breaker can safely interrupt a fault up to that level and still be usable afterward (service breaking capacity Ics is typically 50% or 100% of Icu — check the specific Ics for your SCCR calculation). At 220/240 V AC the interrupting rating jumps to 85 kA Icu, so it handles high-fault locations on the secondary side of a distribution transformer. The 2-pole configuration (2P) with two protected poles (2D) makes this breaker suitable for single-phase or split-phase line-to-line loads — common in control transformer primaries, lighting panels, or small distribution subfeeds.
The 70 mm width and 161 mm height fit standard distribution panel cutouts; the 86 mm depth leaves room for wiring gutters. Power dissipation is 10.78 W per pole — at 125 A load, expect roughly 21.6 W total heat to vent from the enclosure.