Its interrupting capacity reaches 330 kA at 240 V AC and 242 kA at 415/440 V, dropping to 7.5 kA at 690 V — the high 240 V figure tells you this breaker is built for low-voltage high-fault points like transformer secondaries or large motor control centers. Thermal derating is published: full 400 A up to 50 °C, then 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C — useful when the breaker sits in a warm enclosure near other heat sources.
The base switch is order code 3VA2340-7HL32-0AA0.
That depth is shallow enough to fit most standard distribution panels without a deep can — check your gland plate clearance for the rear terminals.