400 A MCCB with 187 kA interrupting — panel fit and trip coordination
The Siemens SENTRON 3VA2340-5HN42-0HH0 is a 4-pole molded case circuit breaker rated for 400 A continuous current (Iu) with a 187 kA interrupting capacity at 240 V — that's the headline number for fault-clearing duty at typical North American distribution voltages. At 415 V and 440 V it still holds 121 kA, and at 500 V it's 75.6 kA; only at 690 V does it drop to 17 kA, which is still adequate for most 690 V motor circuits. That matters when you need selectivity with downstream breakers or want to dial in the trip threshold for a specific load profile. Panel integration is straightforward: the 184 mm width × 248 mm height × 110 mm depth fits the standard SENTRON 3VA frame footprint.
Rated insulation voltage Ui: 800 V. Maximum power loss: 96 W. Mechanical endurance: 15,000 operations (latching). Trip indicator present; voltage trigger present. No communication function, no phase failure detection, no ground fault monitoring version fitted.