The Siemens SENTRON 3VA2450-6JP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 500 A continuous current at 40 °C, with an ETU550 electronic trip unit configured for line protection. It delivers 242 kA breaking capacity at 240 V and 187 kA at 415 V — figures that place it in the high-interrupting class for industrial main feeders or large sub-distribution.
Ratings and what they mean for fit
The 500 A rating holds flat from 40 °C to 50 °C, then derates to 477 A at 55 °C and 410 A at 70 °C. If your panel ambient runs above 50 °C, the continuous current drops — size the breaker for the actual thermal environment, not the nameplate. The 242 kA at 240 V and 187 kA at 415 V cover most North American and European fault-current scenarios; at 690 V the capacity drops to 9 kA, so this breaker is not a primary choice for 690 V systems with high available fault current. The ETU550 electronic trip unit supports communication (Communication Function: Yes), enabling power monitoring and remote trip indication via the SENTRON bus. No ground-fault monitoring is built in — if GF protection is required, you need an external module or a different variant. The 800 V rated insulation voltage (Ui) confirms suitability for 480/277 V and 600 V systems with margin.
Panel integration
The 3VA2450-6JP42-0AA0 measures 184 mm wide × 248 mm high × 110 mm deep. It mounts on a DIN rail or directly to a backplate via the screw terminals. The IP40 front protection means it is suitable for enclosed panels where the door provides additional sealing — not for washdown or outdoor exposure without a secondary enclosure.