630 A MCCB with ETU850 — what the ratings mean for fit
The 3VA2463-5KP32-0AJ0 is a 3-pole SENTRON molded case circuit breaker rated for 630 A continuous current at 40 °C, with an ETU850 electronic trip unit. That 630 A figure is the maximum uninterrupted current the breaker can carry under standard conditions; at elevated panel temperatures the rating derates linearly — 600 A at 45 °C, 570 A at 50 °C, and down to 450 A at 70 °C. For a panel builder, the derating curve matters more than the headline number: if your enclosure runs at 55 °C, the usable rating is 540 A, not 630 A. The interrupting capacity is equally load-dependent: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. That spread covers most industrial distribution voltages, but the 690 V figure is notably lower — verify your fault current at that voltage before committing the BOM line. The ETU850 is a fully electronic, communication-capable trip unit. It supports the Communication Function and Other Measurement Function, meaning it can report current values and trip events over a bus — useful for a plant-wide power monitoring scheme. The breaker also ships with 2 auxiliary switches plus a separate trip alarm switch (HP version), so you get both position feedback and a dedicated fault signal without adding external relays. The rated insulation voltage is 800 V, and the front face carries IP40 protection — fine for a clean indoor panel, but not for washdown environments.
Panel integration — dimensions and mounting
The breaker measures 138 mm wide, 248 mm high, and 110 mm deep. That 138 mm width is a standard 3-pole MCCB footprint — it fits the same cutout as other SENTRON 3VA2 frame breakers. The 110 mm depth is shallow enough for a 200 mm deep enclosure, leaving room for rear busbars or wiring ducts. The maximum power loss is 162 W, so factor that into your thermal budget if the breaker is enclosed without forced ventilation.
Compliance and documentation
As a Siemens SENTRON product, the 3VA2463-5KP32-0AJ0 carries the usual IEC/UL certifications for molded case circuit breakers. The manufacturer provides RoHS and REACH declarations, plus IEC 60947-2 test reports. For an emergency breakdown contractor or a panel builder needing compliance paperwork, these documents are available from Siemens directly or through the distributor at quote time.