What the ratings mean for fit
The Siemens 3VA2340-6JP42-0KE0 is a 4-pole IEC frame 400 molded-case circuit breaker with a 400 A rated current (In) and a class H breaking capacity of 85 kA at 415 V AC. That 85 kA Icu means it can safely interrupt a fault current up to that level without failing — critical for high-fault installations like large transformer secondaries or industrial main feeders where available fault current can exceed 50 kA. The ETU550 electronic trip unit provides LSI protection (long-time, short-time, instantaneous) with adjustable Ir from 160 A to 400 A, Isd from 0.6 to 10x In, and Ii from 1.5 to 10x In, giving you granular selectivity coordination downstream. The built-in shunt trip on the left side operates on 208–277 V AC 50/60 Hz or 220–250 V DC, allowing remote emergency-off or undervoltage release without an external relay. Four auxiliary switches provide status feedback to a PLC or SCADA system. The neutral conductor protection is adjustable from OFF to 100% of In, covering both grounded and ungrounded distribution schemes.
Deployment context
Mounts in a standard panel on a DIN rail or directly on a mounting plate — the nut keeper kit simplifies installation for panel builders. The 4-pole configuration suits three-phase systems with a fully rated neutral, common in North American and European industrial distribution.