Siemens SENTRON 3VA2510-5HN32-0JH0 — 1000 A MCCB with ETU350 Release
The Siemens SENTRON 3VA2510-5HN32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 1000 A. Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V — numbers that tell you this breaker is sized for high-fault main feeders or large distribution panels where SCCR headroom is the deciding spec, not the load current alone. The ETU350 electronic trip unit gives you adjustable long-time pickup (Ir) from 0.5 to 1.0 × Iu, short-time delay (tsd) from 0.04 to 0.4 s, and instantaneous pickup (Ii) up to 10 000 A. That adjustability means you can shape the trip curve to coordinate with downstream breakers — essential for selectivity in a multi-level distribution panel.
Thermal Derating and Panel Fit
The breaker holds its full 1000 A rating from 40 °C through 55 °C ambient. At 60 °C it derates to 955 A, at 65 °C to 885 A, and at 70 °C to 815 A. If your enclosure runs hot — say a packed switchgear lineup — check the ambient at the breaker intake, not the room thermostat. The 123 W maximum power loss at rated current also needs to be vented; don't bury this in a sealed box without accounting for the heat rise. Physical footprint: 320 mm high, 210 mm wide, 120 mm deep. That's a 3-pole frame that fits standard MCCB mounting patterns in switchboards and panelboards. The front face carries an IP40 rating — protected against tools and wires over 1 mm, but not against water ingress, so keep it inside a dry enclosure.