What this MCCB brings to a panel
The Siemens 3VA2463-5KP42-0AA0 is a 4-pole SENTRON molded case circuit breaker rated for 630 A continuous at 40 °C, with an electronic ETU850 overcurrent release that gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves. It's designed for line protection in main or feeder distribution panels, and the 187 kA interrupting capacity at 240 V means it can handle high-fault scenarios without cascading upstream — useful when you're coordinating selectivity downstream of a transformer or generator.
Thermal derating and real-world fit
The 630 A rating holds at 40 °C ambient. Above that, it derates linearly: 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. If your panel runs hot — say a packed enclosure near a furnace line — you'll need to size up the breaker or manage airflow. The 110 mm depth and 184 mm width fit standard MCCB footprints; the 248 mm height means it clears most 600 mm tall enclosures with room for gland plates above.
Interrupting capacity by voltage
This breaker delivers 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. The steep drop at 690 V means it's not the right choice for 690 V main feeders unless your fault current is well under 9 kA — but at 240–480 V it handles nearly any service entrance or subfeed.