Siemens 3VA2510-5HN32-0KC0 SENTRON MCCB, 1000 A, 187 kA at 2

The 3VA2510-5HN32-0KC0 is a 3-pole SENTRON molded case circuit breaker rated for 1000 A continuous current (Iu) at up to 55 °C ambient — no derating needed in a typical 40 °C panel. Above that, the curve drops: 955 A at 60 °C, 885 A at 65 °C, 815 A at 70 °C. If your enclosure runs hot, size the breaker for the actual ambient, not the nameplate. Short-circuit breaking capacity is 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V. The ETU350 electronic trip unit gives you adjustable long-time pickup (Ir) from 0.5 to 1.0 × Iu (500–1000 A), short-time delay (tsd) from 0.04 to 0.4 s, and instantaneous pickup (Ii) up to 10 000 A. That range lets you coordinate selectively with downstream breakers — critical for a main or feeder position where you want a fault isolated to the branch, not a whole-bus blackout.