MCCB for distribution boards — 50 A, 4P, 25 kA
The Schneider Electric C11B44V050B is a ComPacT NSXm moulded-case circuit breaker rated 50 A at 40 °C, 4 poles, with a 25 kA breaking capacity at 415 V AC (performance level B). It carries an electronic MicroLogic 4.1 trip unit and integrated earth-leakage protection — the Vigi module is built in, not an add-on. That means one compact package for distribution boards where both overcurrent and ground-fault protection are specified on the same outgoing feeder.
For a 50 A feeder in a distribution board with a prospective fault level up to 25 kA, this breaker clears the fault without upstream fuses needing to open — that is full selectivity for most industrial LV supplies. Earth-leakage sensitivity is field-selectable: 30 mA, 100 mA, 300 mA, 500 mA, 1 A, 3 A, or 5 A, for both class A and class AC residual currents. That range covers everything from personnel protection (30 mA) to feeder protection against insulation faults (300 mA–5 A). The integrated Vigi saves a module width compared to a separate RCCB + MCCB combination.
Backplate-mounted, 144 mm high, 108 mm wide, 80 mm deep — occupies 12 module pitches at 9 mm each. Connection is front-facing on both line and load sides, with compression lug or busbar terminals. Neutral is on the left.