Overview
The C40W42D400 is a Schneider ComPacT NSX molded case circuit breaker with 4 poles, rated 400 A at 40 °C, and a breaking capacity of 100 kA at 690 V AC. It carries a MicroLogic 2.3 electronic trip unit providing L, So, and I protection for distribution applications. The fixed-mount design uses a toggle control and complies with EN/IEC 60947-2.
Comparison with C40F4
Compared to the C40F4, the C40W42D400 shares the same 4-pole count and 400 A rating but delivers a higher breaking capacity: 100 kA versus 85 kA at 690 V AC. The C40W42D400 also includes a MicroLogic 2.3 electronic trip unit with L, So, and I protection, whereas the C40F4 is a basic frame without integrated protection. This makes the C40W42D400 suitable for applications requiring higher fault current withstand and selective coordination.