What this MCCB is and where it lands
The Siemens 3VA2063-7HL42-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous rated current of 63 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel layout in warm enclosures. The 4-pole construction with an ETU320 electronic trip unit gives you adjustable overload and short-circuit protection curves. No undervoltage release, no ground-fault monitoring, no communication module — this is a straight line-protection breaker for feeders where you don't need auxiliary signaling or remote trip. At 86 mm deep, 140 mm wide, and 181 mm tall, it fits standard MCCB panel footprints. The IP40 front protection means it's fine for indoor switchgear but not for washdown areas.
Breaking capacity — what the numbers mean for your fault level
This breaker's interrupting rating is 330 kA at 240 V AC, dropping to 242 kA at 415 V and 440 V, then 187 kA at 500 V, and 3 kA at 690 V. That 330 kA at 240 V is exceptionally high — it's sized for low-voltage secondary-side faults where available fault current is extreme, like near large transformers. At 415/440 V the 242 kA still covers most industrial main feeders. The sharp drop to 3 kA at 690 V means it's not intended for 690 V line-side protection; at that voltage you're relying on upstream fuses or a higher-rated breaker.
Panel fit and integration notes
Mounts on a standard DIN rail or direct panel-mount via the 4-pole frame's screw terminals. The 140 mm width occupies four 35 mm module spaces on the rail. No communication module means no slot reservation for bus couplers — just power in, power out. Rated insulation voltage is 800 V. Storage temperature range is -40 °C to 80 °C; operating range is -25 °C to 70 °C.