What this MCCB delivers on the panel
The Siemens SENTRON 3VA2450-7HK32-0AA0 is a 3-pole molded case circuit breaker rated for 500 A continuous current at 40 °C, with the ETU340 electronic trip unit handling adjustable overload and short-circuit protection for line protection duty. Breaking capacity hits 330 kA at 240 V AC, stepping down to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 13 kA at 690 V — numbers that define where this breaker can sit in a high-fault distribution panel without cascading upstream. The 800 V rated insulation voltage (Ui) means it's built for 690 V systems with margin. Front face carries IP40 protection, so it's fine in a clean indoor panel but not washdown areas. At 110 mm deep, 138 mm wide, and 248 mm tall, this breaker fits standard SENTRON 3VA mounting footprints — the depth matters when you're swapping into an existing panel with limited gutter space. Power loss runs up to 99 W at full load, so factor that into enclosure thermal calculations if you're packing multiple breakers in a tight cabinet.
Thermal derating and trip unit
The 500 A rating holds flat from 40 °C through 50 °C, then derates gradually: 495 A at 55 °C, 490 A at 60 °C, 485 A at 65 °C, and 480 A at 70 °C. Operating ambient range is -25 °C to 70 °C, storage from -40 °C to 80 °C. The ETU340 electronic trip unit gives you adjustable long-time pickup (Ig) starting at 600 A and short-time/instantaneous settings — critical for coordinating with downstream feeders in a selective system.