The 400 A rating holds flat from 40 °C up to 50 °C, then derates linearly to 340 A at 70 °C — useful to know if the panel runs hot. The basic switch supplied is 3VA2340-5HN42-0AA0; the auxiliary switch design is omitted, meaning no built-in aux contacts on the breaker body. Dimensions are 248 mm high, 184 mm wide, 110 mm deep — a standard 4-pole MCCB footprint for Siemens SENTRON 3VA frames. Panel builders should confirm the mounting hole pattern matches existing busbar or backplate cutouts before committing the BOM.
Breaking capacity by voltage — what it means for selectivity
The 3VA2340-5HN42-0CA0 delivers 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.
Mounts in a standard distribution panel or MCC bucket. The 4-pole design occupies three phase conductors plus neutral. If remote signaling or ground-fault protection is required, a different 3VA variant or an add-on module would be needed.