630 A MCCB with ETU850 — what the ratings mean for fit
The Siemens 3VA2463-6KP32-0AJ0 is a SENTRON molded case circuit breaker rated 630 A continuous current at 40 °C, with a breaking capacity of 242 kA at 240 V and 187 kA at 415 V. That 242 kA figure at 240 V is the short-circuit current it can safely interrupt — critical for fault-level coordination upstream of a transformer or generator bus. The ETU850 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves, plus a communication function for remote monitoring via the breaker's auxiliary contacts (2 auxiliary switches + 1 trip alarm switch HP). At 415 V the breaking capacity is 187 kA, dropping to 40 kA at 690 V. That means this breaker is sized for high-fault installations — think industrial main feeders or distribution panels where available fault current exceeds 100 kA. The 630 A frame also carries a full temperature derating curve: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. If your panel ambient runs above 40 °C, you derate by those steps — no guesswork. Dimensions: 248 mm high, 138 mm wide, 110 mm deep. That 110 mm depth matters for enclosure depth planning — it fits standard 200 mm deep MCC buckets but check your gland-plate clearance if the panel is shallow. IP40 on the front, so it's protected against tools and wires >1 mm, but not against water ingress; keep it inside a rated enclosure.
Integration — panel fit and wiring
Three-pole design with no undervoltage release and no ground-fault monitoring module. The ETU850 trip unit handles overcurrent protection; auxiliary contacts (2 aux + 1 trip alarm) are built in for status feedback to a PLC or SCADA. Communication function is present — typically via a communication module that plugs into the ETU's accessory slot, enabling remote trip indication and current monitoring. Power loss at full rated current is 162 W maximum — account for that heat in your enclosure's thermal budget. Latching endurance rated at 15,000 operations — that's mechanical life, not electrical. For frequent switching duty, the electrical life at rated current will be lower; this breaker is designed for protection, not as a switching contactor. Storage temperature range -40 °C to 80 °C; operating ambient -25 °C to 70 °C. Rated insulation voltage 800 V, so it's suitable for 690 V systems with margin.