400 A MCCB with adjustable trip and high interrupting capacity
The Siemens 3VA2440-6HL32-0JA0 is a 3-pole SENTRON molded case circuit breaker rated for 400 A continuous at ambient temperatures from 40 °C through 70 °C — no derating needed across that span. The adjustable thermal-magnetic trip unit covers 600 A to 4800 A, so you set the pickup to match the downstream load without swapping the breaker frame. Interrupting capacity hits 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. At 690 V the 9 kA rating still clears a fault on a 690 V drive bus, but verify it against your transformer impedance. No undervoltage release, no ground-fault module, no communication function on this variant. The basic switch version is 3VA2440-6HL32-0AA0.
Maximum power loss is 63.5 W at full rated current.