What it is and what it does
The Siemens SENTRON 3VA2340-6JP32-0KL0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, designed for line protection in distribution panels and industrial switchboards. It carries a 242 kA breaking capacity at 240 V, stepping down to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V — the SCCR curve tells you where this breaker can clear a fault without upstream coordination issues.
Thermal derating and panel fit
The 400 A rating holds steady 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 the panel runs hot, the real ampacity is lower than the nameplate. Dimensions are 138 mm wide, 248 mm tall, 110 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or bolt-on backplate layouts without gland-plate rework.
Auxiliary and communication options
This variant ships with 2 auxiliary switches plus 1 trip alarm and 1 electrical alarm switch (HQ configuration), plus a shunt trip release (STL) for remote tripping. A communication function is built in — no separate module needed for basic signaling. The base switch is order code 3VA2340-6JP32-0AA0; this -0KL0 suffix adds the auxiliary and alarm contacts and the shunt trip.