Motor protection breaker for high-fault plant
The Siemens 3VA2563-5MN32-0JA0 is a 3-pole IEC frame 1000 circuit breaker with breaking capacity class M — a 55 kA interrupting rating at 415 V AC. That SCCR headroom means it clears a bolted fault on a 2000 kVA transformer secondary without upstream fuses needing to coordinate; the 630 A continuous rating (In) with an ETU350M LSI trip unit gives adjustable overload protection (Ir from 250 A to 630 A) and short-time pickup (Isd 3–15 × Ir) plus instantaneous fixed at 15 × In.