The C25W46E100 is a 4-pole ComPacT NSX moulded-case circuit breaker from Schneider Electric, fitted with a MicroLogic 6.2 E electronic trip unit rated 100 A at 40 °C. The E designation means it includes energy-metering functions — time-stamped event logs, demand current, power quality, and min/maximeters — alongside the standard L-S-I-G protection (long-time overload, short-time short-circuit, instantaneous, ground fault). That combination makes it a distribution breaker with built-in metering, not just a protection device. Breaking capacity is the headline: 100 kA Icu at 690 V AC 50/60 Hz per IEC 60947-2, also 100 kA at 500 V and 525 V. The utilisation category is A (non-directional, no intentional delay to coordination), so it's a standard distribution breaker, not a selective main. Mechanical durability is 20,000 cycles; electrical durability varies by load — 20,000 cycles at 440 V In/2, 10,000 at 440 V In, 5,000 at 690 V In. That's typical for a 100 A frame in distribution duty; you wouldn't cycle it as a motor starter, but it's fine for infrequent switching or isolation.
Dimensions are 161 mm high, 140 mm wide, 86 mm deep — that's a compact footprint for a 100 A 4-pole breaker. Connection pitch is 35 mm, front-connected both upside and downside. Five slot positions are available for auxiliary contacts, shunt trips, or communication modules — the MicroLogic 6.2 E already occupies one slot internally, leaving four free for accessories. The LCD display shows protection settings, metering data, and alarm logs; local signalling includes a flashing green LED for ready, red LED at 105 % Ir for overload, and orange at 90 % Ir. Operating altitude is 0–2000 m without derating, 2000–5000 m with derating. IK07 impact protection per IEC 62262 means it withstands a 2 J impact — enough for panel handling, not for exposed outdoor use.