Siemens SENTRON 3VA2340-5JP32-0CA0 — 400 A MCCB with Undervoltage Release
The Siemens SENTRON 3VA2340-5JP32-0CA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V AC. The interrupting ratings drop across voltage levels: 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. Thermal derating begins above 50 °C: the breaker holds 400 A up to 50 °C, then steps down to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C.
The breaker measures 138 mm wide, 248 mm high, and 110 mm deep. It mounts into a standard panel or enclosure cutout for SENTRON 3VA frame sizes. The 3-pole design with line protection function suits main or feeder breaker positions in distribution boards. Maximum power loss is 98.5 W at rated current — factor this into enclosure thermal calculations, especially when grouping multiple breakers in a confined space.