The Siemens SENTRON 3VA2340-5HL42-0BH0 is a 4-pole molded case circuit breaker rated for 400 A continuous current, with an adjustable thermal-magnetic trip unit covering 600 A to 4 000 A. The interrupting ratings are what make this breaker stand out: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. That SCCR headroom means it can be installed upstream of smaller breakers without worrying about cascading failure during a fault — the breaker clears the arc before the fault energy damages downstream gear. The 400 A rating holds steady from 40 °C up 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.
The breaker measures 184 mm wide, 248 mm high, and 110 mm deep. The 4-pole footprint occupies roughly 7.24 inches of rail width — plan the enclosure fill factor accordingly. Maximum power loss is 98.5 W at rated load. Manage heat inside the enclosure per standard derating rules. The UVR ensures the breaker trips if control voltage drops below the dropout threshold — a standard requirement for safety disconnects on motor feeders and emergency-stop circuits.