The Siemens SENTRON 3VA2340-5KP32-0JL0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, designed for line protection in distribution panels. Its interrupting capacity reaches 187 kA at 240 V and 121 kA at 415 V and 440 V, dropping to 75.6 kA at 500 V and 7.5 kA at 690 V — the 690 V figure is the one to watch if your system runs at that voltage; it's still adequate for most industrial service-entrance applications but coordination studies need to confirm selectivity at the lower end.
Thermal derating and panel fit
The breaker holds its full 400 A rating up to 50 °C ambient; above that it derates linearly to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel runs hot — say a non-ventilated enclosure near a furnace line — size the load side for the derated figure, not the nameplate. Dimensions are 248 mm high, 138 mm wide, 110 mm deep, which fits standard Siemens SENTRON mounting footprints; the 110 mm depth is shallow enough for most 400 mm deep enclosures without forcing a deeper can.
Auxiliaries and communication
This variant ships with a shunt trip release (STL) and a full auxiliary switch complement: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ configuration). It also includes a voltage trigger and a communication function — likely for remote monitoring or integration with a higher-level energy management system. No undervoltage release is fitted, so if your safety circuit requires UVR for machine isolation, you'll need to add it externally or spec a different variant. The supplied basic switch is order code 3VA2340-5KP32-0AA0, which is the core breaker without auxiliaries.