MCCB for line protection — 400 A, 3-pole, high interrupting capacity
The Siemens SENTRON 3VA2440-7HL32-0JL0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection, rated at 400 A continuously across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. Its interrupting capacity reaches 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 9 kA at 690 V, making it suitable for high-fault installations where upstream coordination demands a robust withstand. The breaker carries a shunt trip (STL) auxiliary release and a complement of two auxiliary switches plus one trip alarm switch and one electrical alarm switch, providing status feedback for remote monitoring or PLC-based shutdown logic. Dimensions are 248 mm high, 138 mm wide, and 110 mm deep — the depth is the critical panel-space dimension when planning gland-plate clearance or door-swing interference.
Integration and wiring considerations
The breaker mounts in a standard panel or enclosure footprint; its 110 mm depth fits most 200 mm deep enclosures without door interference. The shunt trip (STL) requires a separate control voltage — verify polarity and coil rating against the panel's control transformer before energizing. Maximum power loss is 63.5 W at rated current — factor this into enclosure thermal calculations to avoid nuisance tripping from internal heat buildup.