What this 3VA1 frame breaker brings to the panel
The Siemens 3VA1340-6EE42-0AA0-ZD00 is a 4-pole IEC frame 400 circuit breaker with class H breaking capacity — 70 kA at 415 V — meaning it clears high-fault currents without upstream coordination headaches in a main or feeder position. The TM220 thermal-magnetic trip unit gives you adjustable overload protection (Ir = 280 A to 400 A) and a fixed short-circuit pickup at 10× In (4000 A), so it's sized for a 400 A bus or a large motor control center feeder. The N conductor is unprotected on this variant, and the nut keeper kit is included for the DC Power OEM build in China.