The Siemens SENTRON 3VA2463-6JP42-0AA0 is a 4-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, fitted with an ETU550 electronic trip unit. This is a line-protection design — meaning it's sized for main feeder or large sub-distribution duty, not motor branch circuit protection. The 4-pole configuration covers three-phase plus neutral, common in North American and IEC panels where the neutral needs overcurrent protection or isolation. Breaking capacity is substantial: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. The ETU550 is a programmable electronic trip unit with LSI (long-time, short-time, instantaneous) protection curves and communication capability. The communication function means it can integrate with a building management or power monitoring system via the SENTRON communication modules — useful for energy management or remote trip indication in critical feeders.
Temperature derating — real-world current capacity
Above that, the breaker must be derated: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. For a 630 A feeder in a 50 °C panel, plan for 570 A maximum without nuisance tripping. The power loss at full rated current is 162 W maximum — factor that into enclosure ventilation if the panel is sealed or has multiple breakers.
Mounting dimensions and panel fit
Dimensions: 248 mm high, 184 mm wide, 110 mm deep. The 184 mm width is for a 4-pole frame.