The Siemens SENTRON 3VA2340-7HN32-0CL0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, configured for line protection with an ETU350 electronic trip unit. It carries a 330 kA breaking capacity at 240 V, stepping down to 242 kA at 415 V and 52.5 kA at 690 V — figures that define the fault-clearing envelope for the distribution panel it protects.
Rated continuous current holds flat at 400 A from 40 °C through 50 °C ambient, then derates to 385 A at 55 °C and 340 A at 70 °C. That thermal curve means the breaker delivers its full nameplate rating in a typical 50 °C panel interior without derating — a practical advantage when the enclosure runs warm from adjacent loads. The auxiliary contact block ships as 2 auxiliary switches plus 1 trip alarm switch plus 1 electrical alarm switch (HQ type). That gives the controls integrator four discrete signals for status feedback — breaker ON/OFF, trip event, and a separate electrical alarm — without adding a separate contact module.
The breaker mounts in a standard panel footprint at 138 mm wide, 248 mm tall, 110 mm deep. Undervoltage release (UVR) is integrated — designated by the -0CL0 suffix — so the breaker drops out on loss of control voltage without an external relay. The UVR is factory-fitted to the supplied basic switch (3VA2340-7HN32-0AA0) and wired to the integrated auxiliary trip (3VA9608-0BB24). Maximum power loss is 98.5 W at rated load. That figure drives the ventilation or de-rating calculation for the enclosure — a panel builder sizing a sealed cabinet needs to account for that dissipation, especially when multiple breakers share the same compartment.