630 A MCCB with ETU560 — what the ratings mean for your panel
The Siemens SENTRON 3VA2463-5JQ32-0BL0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 630 A at 40 °C. That 630 A figure is the thermal baseline — above 40 °C you derate linearly down to 450 A at 70 °C, so the real-world ampacity depends on your enclosure's internal ambient. The ETU560 electronic trip unit gives you adjustable LSI protection (long-time, short-time, instantaneous) plus ground-fault summation monitoring on the L-conductor, which is the main reason this breaker costs more than a thermal-magnetic version — you get coordination flexibility and selective tripping for downstream feeders. Breaking capacity runs 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 17 kA at 690 V. That 187 kA figure at 240 V is high for a 630 A frame — it handles utility-grade fault currents near the transformer secondary without needing a current-limiting fuse upstream. At 690 V the 17 kA rating is modest; if your system runs 690 V with high available fault current, you'll want to verify coordination with the upstream device.
Integration and wiring notes
The breaker measures 110 mm deep by 138 mm wide by 248 mm tall. That 110 mm depth is the dimension from the mounting surface to the front of the arc chamber — account for it when sizing the gland plate and door clearance on a 600 mm deep enclosure. The 138 mm width for a 3-pole 630 A frame is standard for the SENTRON 3VA platform; it fits the same mounting footprint as other 3VA breakers in this current class, so a panel laid out for a 3VA2 630 A unit accepts this one without drilling new holes. Maximum power loss is 164.5 W. That's the heat the breaker dumps into the enclosure at full rated current — factor it into your thermal budget, especially if the panel packs multiple breakers in a row. The undervoltage release (UVR) is built in, so you get automatic trip on loss of control voltage without adding an external module. Auxiliary contacts are configured as 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch (HQ type), giving you status feedback for the PLC or BMS without extra wiring.