The Siemens 3VA1463-4EF42-0BB0 is a SENTRON molded case circuit breaker (MCCB) rated for 630 A continuous current at ambient temperatures from 40 °C to 50 °C, with only minor derating above that — 618 A at 55 °C, 607 A at 60 °C, 595 A at 65 °C, and 583 A at 70 °C. That means in a 40 °C panel environment, it carries the full 630 A without de-rating, and even at 70 °C it still delivers 583 A, which is useful for high-ambient installations like switchgear rooms or outdoor enclosures. The 4-pole configuration covers three-phase plus neutral, common for 3-phase distribution in industrial and commercial buildings. Breaking capacity is 121 kA at 240 V AC, 75.6 kA at 415 V and 440 V, 52.5 kA at 500 V, and 11.9 kA at 690 V.
Built-in undervoltage release — protection logic on the breaker
That is a key feature for motor control centers or process lines where a brownout could cause contactors to drop out and motors to stall — the UVR ensures the breaker opens cleanly rather than re-closing onto a fault after voltage returns. The auxiliary switch design is 2 HP (high-performance) switches, providing status feedback for remote monitoring or PLC inputs. There is no trip indicator (mechanical flag) on this variant, so the auxiliary contacts are the primary way to detect a trip remotely.
Physical fit — panel and enclosure integration
Dimensions are 110 mm depth, 184 mm width, and 248 mm height. The 110 mm depth is relatively shallow for a 630 A MCCB, which helps in shallow enclosures or when gland plates are tight. Maximum power loss is 195.4 W, which should be factored into enclosure thermal calculations — at full load, that heat must be dissipated to avoid exceeding the 70 °C maximum operating temperature.
Environmental and storage range
The storage range exceeds the operating range — that is typical for handling and shipping, not running conditions.