The Schneider Electric C11E44V050L is a ComPacT NSXm moulded-case circuit breaker rated 50 A at 40 °C, four-pole (4P), with a breaking capacity of 16 kA at 415 V AC — performance level E. It carries an electronic MicroLogic 4.1 trip unit that provides adjustable thermal-magnetic protection curves and integrated earth-leakage protection (Vigi module) with selectable sensitivity from 30 mA to 5 A for class A or class AC faults. It handles 50/60 Hz networks, mounts on a backplate in horizontal or vertical orientation, and uses front-front connection via Everlink lugs (accepting 2.5–70 mm² fine stranded copper or 2.5–95 mm² rigid/stranded aluminium/copper).
No official successor exists because this part is active. If your BOM calls for the C11E44V050L, the MicroLogic 4.1 trip unit and the Vigi earth-leakage module are factory-integrated — no separate ordering of the trip unit and Vigi add-on. This is the single-order-code path for a 50 A 4P MCCB with adjustable earth-leakage in the ComPacT NSXm family.
Mounts on a backplate — not DIN rail — so plan for a drilled panel or a mounting plate with the 108 mm width × 144 mm height footprint (12-module pitch at 9 mm per module). IP40 enclosure protection (IK07 impact resistance) means it's suited for indoor panel installation where dust and tool drops are the main concern — not washdown environments. The grey RAL 7016 housing is the standard industrial finish across the ComPacT range.
Derate for higher ambient temperatures per IEC 60947-2; the electronic trip unit compensates automatically for ambient changes, but the conductor sizing still needs to follow the 50 A mark. Earth-leakage sensitivity is field-selectable via the Vigi module: choose 30 mA, 100 mA, 300 mA, 500 mA, 1 A, 3 A, or 5 A for class A or class AC residual currents. Class A detects pulsating DC residuals — critical for circuits with electronic loads (VFDs, switched-mode supplies) that generate half-wave fault currents. Class AC covers sinusoidal AC only. Set the threshold to match the downstream protection coordination. Mechanical durability is 20,000 cycles; electrical durability is 20,000 cycles at 440 V at rated current (In) and 10,000 cycles at 440 V at twice rated current (In/2). For a distribution breaker used infrequently (a few operations per year), this is effectively a lifetime rating. For frequent switching applications (like motor control), the electrical endurance at In/2 is the limiting curve.