What it is and what it does
The Siemens 3VA2063-5HN46-0AA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Four poles, electronic ETU350 trip unit, line-protection design. This is the part you spec when you need a 63 A feed from a 240 V panel that can take a 187 kA fault without upstream coordination headaches. Interrupting capacity drops as voltage climbs: 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 690 V figure is the weak leg — if your system runs at 690 V line-to-line, this breaker is not your main; it's a downstream branch device with a 3 kA fault ceiling. Rated insulation voltage is 800 V, so the bus bars and internal clearances handle 690 V systems fine — the interrupting limit is the constraint, not the insulation.
Mounting and panel fit
Footprint: 140 mm wide, 181 mm tall, 86 mm deep. That 86 mm depth is the dimension that matters when you're swapping into an existing panel — measure the can depth before ordering. IP40 on the front face; the rest of the breaker is open to the enclosure environment, so it lives inside a sealed cabinet, not outdoors. Power loss at rated current is 5.4 W maximum — negligible for thermal budgeting in a standard steel enclosure, but worth noting if you're packing multiple breakers into a small stainless washdown box with no fan.
Lifecycle and sourcing
Lifecycle stage is marked 'current' — this is an active-production part in the SENTRON 3VA2 family. No end-of-life notice, no last-time-buy window. It's sourced through standard Siemens distribution channels; we quote it to order against an RFQ with current pricing and availability confirmed at quote time. Storage temperature range is -40 °C to 80 °C, operating range -25 °C to 70 °C. That storage floor matters if this sits in an unheated warehouse through a northern winter — it's fine down to -40, but don't energize it below -25.