What this MCCB carries — and where it stops
The Siemens 3VA2163-5HN32-0AH0 is a 3-pole SENTRON molded case circuit breaker rated for 63 A continuous current (Iu) with an ETU350 electronic trip unit, configured for line protection. Breaking capacity runs 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V — so the high-fault rating at the lower voltages is what you're buying here; the 690 V figure tells you this isn't a 690 V main breaker for a high-impedance system.
Thermal derating — what the 63 A really means at panel ambient
The 63 A rating holds flat up to 50 °C ambient. Above that it steps down: 60.6375 A at 55 °C, 58.275 A at 60 °C, 55.9125 A at 65 °C, and 53.55 A at 70 °C. If your panel runs hot — say a non-ventilated enclosure near a furnace line — you lose nearly 10 A off the nameplate by 70 °C. Size the upstream conductor and downstream load accordingly; the trip unit doesn't compensate for ambient inside the enclosure.
Auxiliary contacts and trip alarm — what's on the side
This variant ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). That's enough for a remote status signal and a separate alarm on fault trip without adding a module. No undervoltage release, no ground-fault monitoring, no communication function — it's a straight line-protection breaker with local indication and basic remote feedback.
Panel fit — dimensions and front IP
Footprint is 105 mm wide by 181 mm tall by 86 mm deep. Front face carries IP40 protection — fine for a clean indoor panel, not for washdown or outdoor exposure. Mounts on a DIN rail or direct panel; the 86 mm depth means it clears a standard 200 mm deep enclosure with room for wiring gutters.
Lifecycle and sourcing posture
Listed as current production — no phase-out notice on this code. That means it's a standard BOM line, not a last-time-buy scavenger hunt. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.