The Siemens 3VA2340-5HL42-0AJ0 is a SENTRON molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with a 4-pole configuration and a maximum breaking capacity of 187 kA at 240 V. The 187 kA interrupting rating at 240 V gives substantial SCCR headroom for high-fault installations, while the 121 kA at 415 V and 75.6 kA at 500 V keep it viable across common global voltage levels.
The 400 A rating holds flat from 40 °C to 50 °C, then derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. Maximum power loss is 96 W.
Dimensions are 248 mm high, 184 mm wide, and 110 mm deep. The 184 mm width for a 4-pole frame is typical for this class — verify the DIN-rail or mounting-plate footprint against the existing panel layout before ordering.
The 4,000 A maximum short-circuit current setting range (600 A minimum) allows the breaker to be tuned for selective coordination with downstream devices. For a site electrical engineer, the lack of a UVR means the breaker will not automatically trip on voltage loss — a deliberate choice for processes that must ride through sags.