What this 3VA2 frame breaker delivers
The Siemens 3VA2510-6HL42-0AL0 is a 4-pole IEC frame 1000 circuit breaker with H class breaking capacity — Icu=85kA at 415 V AC — meaning it can safely interrupt fault currents up to that level without upstream cascading, a key spec for high-fault panel coordination. It carries the ETU320 LI electronic trip unit, rated In=1000 A, with overload protection Ir adjustable from 400 A to 1000 A and short-circuit protection Ii adjustable from 1.5 to 10 x In. The N-conductor protection is also adjustable (OFF, 50%, 100%).
Panel integration and thermal profile
For a furnace control panel where ambient temperatures can approach 50-60°C near the breaker compartment, the ETU320's thermal memory and adjustable Ir let you dial the trip curve to match the actual load profile without nuisance tripping.