What this MCCB is and what the ratings mean for fit
The Siemens 3VA2063-8HL36-0AA0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection — the primary feeder breaker in a distribution panel or as the main disconnect for a machine. It carries a continuous current rating of 63 A across the full ambient range from 40 °C to 70 °C (–), which means no derating curve to chase in a warm enclosure; the breaker holds its 63 A all the way up to 70 °C. The interrupting ratings are what decide whether it clears a fault without welding or rupturing: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V. At 690 V the 52.5 kA figure still covers most industrial service-entrance faults. The ETU320 overcurrent release is a solid-state trip unit — adjustable thermal and magnetic settings, so you can fine-tune the long-time pickup and short-time delay to coordinate with downstream breakers. Three poles, insulation voltage rated 800 V, and max power loss of 3 W — the heat dissipation is low enough that you don't need forced ventilation in a standard panel. Front protection is IP40, meaning tools and fingers stay out but it's not sealed against hose-down; keep it in a dry enclosure.
Panel fit and integration
Dimensions are 105 mm wide by 181 mm tall by 86 mm deep — a standard MCCB footprint that drops into most 3-pole breaker slots on a DIN-rail adapter or direct-mount base. The 86 mm depth is shallow enough for 200 mm deep enclosures with the door closed. No undervoltage release, no voltage trigger, no communication function, and no ground-fault monitoring — it's a plain line-protection breaker; if you need those add-ons, you're looking at a different variant in the 3VA2 family.