The Siemens 3VA2440-7HL32-0AB0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 400 A across the full ambient range from 40 °C to 70 °C with no derating needed — that's the same 400 A at 70 °C as at 40 °C, so you don't lose headroom in a hot panel.
SCCR and interrupting capacity
Interrupting capacity hits 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and drops to 9 kA at 690 V — the 690 V figure is the one to watch if you're on a 690 V line; that's a significant step down from the 500 V rating. Maximum rating is 4800 A, minimum 600 A, with a short-time withstand of 5 kA limited to 1 second.
Physical fit and auxiliary switches
Dimensions are 138 mm wide, 248 mm high, 110 mm deep — that's a 5.43 by 9.76 by 4.33 inch footprint, so check your panel gland plate and DIN-rail spacing before committing. Comes with 2 auxiliary switches (HP design) built in; no auxiliary release fitted, no trip indicator, no voltage trigger.