What this MCCB carries — and where it holds
The Siemens SENTRON 3VA2063-6HN32-0JC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current. That 63 A holds all the way to 50 °C ambient — no derating needed in a warm panel — then steps down gradually to 53.55 A at 70 °C. The ETU350 electronic trip unit gives you adjustable overload and short-circuit protection curves, not just a fixed thermal bimetal. Interrupting capacity hits 242 kA at 240 V and still clears 187 kA at 415 V, so it handles high-fault scenarios like transformer secondaries or large motor control centers without cascading upstream.
Panel fit and wiring
The breaker measures 105 mm wide by 181 mm tall by 86 mm deep — standard SENTRON 3VA2 footprint. It mounts on a DIN rail or direct panel; the 86 mm depth leaves room for rear-connected busbars or a shunt trip accessory in the same enclosure depth. The auxiliary contact version ships with 2 HQ auxiliary switches, and the shunt trip (STL) release is built in as the auxiliary release design. No undervoltage release, no ground fault monitoring, no communication module — this is a straight line-protection MCCB with remote trip capability via the shunt coil.
What the ratings mean for your decision
The 63 A rating at 40–50 °C is the working number for sizing a feeder or main breaker in a panel that sees ambient heat from transformers or drives. The interrupting ratings — 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4 kA at 690 V — tell you this breaker can clear a bolted fault on a high-capacity utility service without blowing apart. The ETU350 release is adjustable, so you can set the long-time pickup and short-time delay to coordinate with downstream breakers. Power loss is 5.4 W maximum — negligible for thermal budget in a crowded enclosure.