500 A MCCB with ETU850 electronic trip — line protection for high-fault panels
The Siemens SENTRON 3VA2450-6KP32-0AA0 is a 3-pole molded case circuit breaker rated for 500 A continuous at 40 °C, designed for line protection in main distribution panels. Its ETU850 electronic overcurrent release provides adjustable trip curves, and the breaker carries a 242 kA breaking capacity at 240 V — enough for high-fault installations without cascading upstream.
Breaking capacity across voltage — selectivity planning
The interrupting rating drops from 242 kA at 240 V to 187 kA at 415 V and 440 V, then to 121 kA at 500 V, and 9 kA at 690 V. That 690 V figure is the hard limit — verify the available fault current at your system voltage before committing the BOM line. The 7 000 A maximum and 750 A minimum trip settings give the ETU850 wide adjustment range for coordination studies.
Thermal derating and power loss
The breaker holds its full 500 A rating through 50 °C ambient. Above that, it derates to 477 A at 55 °C, 455 A at 60 °C, 432 A at 65 °C, and 410 A at 70 °C. Maximum power loss is 99 W — account for that heat in the panel's thermal budget, especially in a sealed enclosure. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Physical fit and integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. It mounts on a DIN rail or directly to a backplate in the switchboard. The 3-pole form factor is standard for 500 A MCCBs; verify the busbar spacing and lug kit compatibility with your existing panel layout. Communication function is onboard, so it can report status and trip data to a higher-level system without an external module.