The Siemens 3VA1340-4EF32-0AA0-ZD00 is a 3-pole IEC frame circuit breaker rated 400A continuous, with a 36kA interrupting capacity at 415V (class S). It carries TM240 line protection and ATAM — meaning the thermal-magnetic trip unit is fixed at 240A thermal pickup, with adjustable overload protection from 280A to 400A (Ir) and short-circuit protection set from 5 to 10 times In (Ii).
The adjustable Ir (280–400A) lets you match the breaker to the actual load current, not just the frame size — useful when the connected load is below 400A and you want tighter overload protection.