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. It is designed for line protection and includes an integrated undervoltage release and a communication function for integration into higher-level control systems. 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. This derating curve is typical for MCCBs and must be checked against the available fault current at the point of installation. 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 maximum operating ambient is 70 °C, with storage range from -40 °C to 80 °C.
Integration and Mounting
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.