The Siemens SENTRON 3VA2340-5HN32-0AG0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, designed for line protection in distribution panels and industrial switchgear. Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — figures that govern selectivity and SCCR coordination in high-fault installations.
Thermal derating and power loss
The breaker holds full 400 A rating up to 50 °C ambient; above that it derates linearly to 340 A at 70 °C. Maximum power loss is 96 W — relevant for enclosure thermal calculations when grouping multiple breakers on a DIN-rail or mounting plate.
Dimensions and panel fit
Physical footprint: 138 mm wide, 248 mm high, 110 mm deep. The 3-pole frame fits standard MCCB mounting cutouts in SENTRON distribution boards and retrofit panels. Verify busbar spacing and lug kit compatibility with the existing assembly before committing the BOM line.