The Schneider Electric C40V45E400 is a ComPacT NSX400HB1 molded-case circuit breaker rated 400 A at 40 °C, with an 85 kA Icu breaking capacity at 500 V AC (50/60 Hz) per IEC 60947-2. It carries an electronic MicroLogic 5.3 E trip unit with L, S, and I protection curves, plus an LCD display for energy metering and event logging.
The 400 A trip rating at 40 °C sets the continuous current limit in a 40 °C ambient. That's a high-fault rating for a 400 A frame, suitable for transformer secondaries or industrial mains. The MicroLogic 5.3 E trip unit is fully electronic, offering long-time (L), short-time (S), and instantaneous (I) protection. It also logs energy metering data, demand current, power quality indicators, and time-stamped events — useful for a facility engineer tracking load profiles or coordinating with upstream breakers. Mechanical durability is rated at 15,000 cycles, and electrical durability at 12,000 cycles at 440 V at half rated current (In/2), or 6,000 cycles at full In. That's a solid lifespan for a distribution breaker — it'll handle years of routine switching in a panel without wearing out the contacts.
This is a 4-pole breaker, 185 mm wide, 255 mm tall, 110 mm deep, with a 45 mm pole pitch. It mounts flat on a backplate — no DIN rail here; it bolts directly to the panel's mounting surface. Front connections both top and bottom make wiring straightforward in a dead-front enclosure. The toggle handle and LCD display are up front, and the six accessory slots let you add shunt trips, auxiliary contacts, or communication modules without pulling the breaker.