What this MCCB delivers — and what it means for your panel
The Siemens 3VA2440-5HN32-0JL0 is a SENTRON molded case circuit breaker designed for line protection, rated 400 A continuous at temperatures up to 70 °C — no derating needed across the full 40 °C to 70 °C range, which simplifies thermal budgeting in a crowded enclosure. Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V — covering most industrial service-entrance and distribution applications on the low-voltage side of a transformer. The 3-pole frame (138 mm wide, 248 mm tall, 110 mm deep) mounts into standard switchboard or panel-mount cutouts; the 110 mm depth is a key constraint for shallow back-panel enclosures where a deeper breaker would force a larger cabinet.
Auxiliary configuration and internal wiring
This variant ships with a factory-installed auxiliary switch block: 2 auxiliary switches, 1 trip alarm switch, plus 1 electrical alarm switch (HQ type), and a shunt trip (STL) release for remote tripping — enough signaling for most motor control center or generator paralleling schemes without adding a separate accessory kit. The basic switch (the interrupting module) carries order code 3VA2440-5HN32-0AA0, which is the interchangeable core; the '-0JL0' suffix adds the auxiliary and shunt-trip package. Maximum power loss is 63.5 W at rated load — account for this in the enclosure thermal calculation alongside other heat sources.