MCCB with 400 A continuous rating and high interrupting capacity
The Siemens SENTRON 3VA2440-7HL32-0BA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current across the entire operating temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. Its interrupting capacity reaches 330 kA at 240 V and 242 kA at 415 V, which puts it in the high-fault-current class for main feeders or large sub-distribution boards where available fault current is substantial. At 690 V the rating drops to 9 kA, so verify the system voltage against the required SCCR before specifying. The part is designed for line protection and includes an undervoltage release — a common requirement for safety circuits that need to trip on loss of control voltage. The basic switch variant is 3VA2440-7HL32-0AA0, meaning this order code adds the undervoltage release to that base unit.
Integration and physical fit
The 3VA2440-7HL32-0BA0 measures 248 mm high, 138 mm wide, and 110 mm deep. These dimensions match the standard SENTRON 3VA frame footprint for 400 A breakers. Panel cutout and mounting-hole pattern are consistent across the series, so a panel designed for a 3VA2 frame accepts this unit without modification. Maximum power loss is 66 W — account for that heat load in the enclosure thermal calculation, especially when grouping multiple breakers.
Key ratings and what they mean for coordination
The minimum breaking capacity is 600 A, which is the lowest fault current the breaker can reliably interrupt. For selectivity studies, the 330 kA at 240 V and 242 kA at 415 V figures define the maximum fault current the breaker can clear without damage — essential for verifying coordination with upstream devices. The 400 A continuous rating at 70 °C ambient means no derating in warm enclosures, a real advantage in packed panels or outdoor cabinets exposed to solar gain.