The Siemens 3VA2325-5HL42-0AF0 is a 4-pole IEC frame 400 circuit breaker with a 250 A nominal rating and a 55 kA breaking capacity at 415 V. It carries the ETU320 LI trip unit, providing adjustable overload protection (Ir = 100 A to 250 A) and short-circuit protection (Ii = 1.5 to 12 × In). The N-conductor protection is adjustable to OFF, 50%, or 100% of the phase current.
What the ratings mean for panel fit
The 55 kA Icu at 415 V places this breaker in the M (medium) breaking capacity class per IEC 60947-2, meaning it can safely interrupt fault currents up to that level without upstream fuses or cascading. For a 250 A feeder on a 415 V distribution board, this gives solid selectivity headroom downstream. The ETU320 LI is a basic electronic trip unit — no ground-fault or communications module — so it fits line-protection duty where you need adjustable thermal and magnetic settings without the complexity of a full power-monitoring trip.