The Siemens SENTRON 3VA1340-4EF32-0KH0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection, rated 400 A at 40 °C with a maximum breaking capacity of 121 kA at 240 V AC and 75.6 kA at 415 V AC. It carries an insulation voltage rating of 800 V and a maximum power loss of 92.1 W.
At 240 V the breaker clears 121 kA; at 415 V it clears 75.6 kA. That SCCR headroom allows the 3VA1340 to serve as a main or feeder breaker in high-fault panels where downstream devices need selective coordination. The 400 A continuous rating at 40 °C holds steady through 50 °C (still 400 A), then derates to 392 A at 55 °C and 367 A at 70 °C — useful when the breaker sits in a warm enclosure.
The 3-pole footprint is standard for SENTRON 3VA frames, so a panel originally laid out for a 3VA1110-series MCCB will accept this unit without rewiring — the mounting hole pattern and bus-bar spacing are identical across the 3VA family.