The Siemens SENTRON 3VA2440-6HN32-0BC0 is a 3-pole molded case circuit breaker rated for 400 A continuously across the full ambient range from 40 °C to 70 °C — no derating needed in a warm enclosure. Its maximum breaking capacity hits 242 kA at 240 V AC, dropping to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. The 4800 A maximum rating (likely the short-time withstand or instantaneous trip setting) is the same as the minimum, so the breaker's magnetic trip is fixed, not adjustable. The basic switch variant is 3VA2440-6HN32-0AA0, so this -0BC0 suffix adds the UVR and auxiliary switches.
Measures 248 mm tall, 138 mm wide, and 110 mm deep. Power loss is 66 W maximum at rated current.