63 A SENTRON MCCB with ETU350 — panel-builder commissioning notes
The Siemens SENTRON 3VA2063-8HN32-0AA0 is a 3-pole molded case circuit breaker rated for 63 A continuous current, fitted with an ETU350 electronic trip unit. It's designed for line protection — meaning it sits at the feeder or main distribution point in a panel, not downstream on a motor branch. The interrupting capacity is substantial: 440 kA at 240 V, 330 kA at 415 V, and still 52.5 kA at 690 V, so it handles high-fault scenarios without cascading upstream. The ETU350 gives you adjustable thermal-magnetic or electronic trip curves depending on the variant, but here it's the electronic version — better accuracy and selectivity coordination than a fixed thermal breaker.
Sourcing and lifecycle — current production, no end-of-life notice
For BOM freeze or PCN watch, the ETU350 trip unit is a known design; no recent change notices on record. If you're maintaining an installed base, the 3VA2063-8HN32-0AA0 is a direct drop-in replacement for earlier 3VA2 variants with the same frame size and trip unit.
Integration — panel cutout and thermal derating
Physical dimensions: 86 mm depth, 105 mm width, 181 mm height. The depth is the key number for enclosure depth clearance — 86 mm (3.39 in) means it fits most 200 mm deep enclosures with room for wiring behind it. Width at 105 mm (4.13 in) matches standard 3-pole MCCB spacing on a DIN rail. Thermal performance is flat across the board: 63 A continuous from 40 °C all the way up to 70 °C ambient. No derating needed for elevated panel temperatures within that range — useful if the breaker sits near transformers or drives that push internal enclosure temps. Rated insulation voltage is 800 V, so it's comfortable on 480/277 V or 600 V systems with headroom.