Siemens 3VA2063-8JP32-0AA0 — what it is and what the ratings mean
The Siemens 3VA2063-8JP32-0AA0 is a SENTRON molded case circuit breaker (MCCB) with three poles, rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That 63 A holds steady at every temperature step in between, which simplifies panel sizing when the enclosure runs hot. The headline interrupting rating is 440 kA at 240 V, dropping to 330 kA at 415 V and 440 V, then 220 kA at 500 V, and 53 kA at 690 V. That 440 kA figure at 240 V is the number that governs fault-clearing capability on a 240 V line — it tells you this breaker can interrupt a fault up to that level without welding contacts or cascading upstream. For a 400 V-class panel, the 330 kA at 415 V is the practical limit to coordinate against. It ships with an ETU550 electronic trip unit — that's the programmable overcurrent release that lets you dial in long-time pickup, short-time delay, and instantaneous thresholds. The adjustable response time for the short-time delay (tsd) ranges from 0 to 0.5 s, and the long-time ramp (tr) is adjustable between 0.5 and 25 s. That flexibility is what makes this breaker suitable for selective coordination downstream of a main breaker: you can delay the trip long enough to let a branch device clear a fault first.
Where it fits — panel integration and environment
The 3VA2063-8JP32-0AA0 measures 105 mm wide, 181 mm tall, and 86 mm deep. Front-side protection is IP40 — splash-proof from the front but not sealed against dust ingress into the enclosure. That's typical for a panel-mounted MCCB; the enclosure itself carries the overall IP rating. Storage range spans -40 °C to 80 °C, operating range -40 °C to 70 °C, so it handles cold warehouses and hot switchgear rooms alike. Rated insulation voltage is 800 V. Maximum power loss is 3 W.
Lifecycle and sourcing reality
Communication function is built in (yes), which means the ETU550 can interface with a communication module for remote monitoring and trip-event logging — useful if you're building a smart panel with power monitoring upstream.