The 3VA2450-5MN32-0AD0: Breaking capacity hits 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 17 kA at 690 V — that's a strong SCCR profile for transformer-fed or generator-backed switchboards where fault current runs high. The ETU350M release provides adjustable protection curves.
Current derating and thermal budget
Full 500 A rating holds up to 50 °C ambient. Above that, it derates linearly: 495 A at 55 °C, 490 A at 60 °C, 485 A at 65 °C, and 480 A at 70 °C. In a crowded panel or a hot electrical room, that derating curve is what determines whether you need a larger frame or forced ventilation. Maximum power loss is 99 W — that's the heat the breaker dumps into the enclosure at full load. For a multi-breaker lineup, sum these up against the panel's dissipation rating to avoid nuisance tripping from ambient build-up. The storage limit governs long-term shelf life — the -40 °C floor matters if the spare sits in an unheated warehouse.
Ships with 3 auxiliary switches (HQ type) factory-installed. That's enough for remote status indication — one for open/closed, one for tripped, one spare — without adding external relay logic. Phase failure detection is built into the ETU350M release. No separate phase-loss relay needed for motor protection applications — the trip unit handles it.