500 A continuous, 121 kA interrupting — selectivity headroom for the main feeder
The Siemens SENTRON 3VA1450-5EF32-0AA0 is a 3-pole molded case circuit breaker rated 500 A at 40 °C ambient, carrying the full 500 A up to 50 °C before the thermal derating curve begins — at 55 °C it's still 488 A, at 70 °C it holds 452 A. The TM240 overcurrent release gives a fixed thermal-magnetic curve — thermal for overload, magnetic for short-circuit — with no electronic adjustment, so it's a straight swap for existing TM-based designs. Interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, and 121 kA at 440 V — that's high-end SCCR for a 500 A frame, giving real selectivity headroom downstream. At 690 V it still clears 11.9 kA, enough for most 690 V distribution.
Active production — BOM-stable for new builds and spares
The 3VA1450-5EF32-0AA0 measures 138 mm wide by 248 mm tall by 110 mm deep — a standard 3-pole MCCB footprint that drops into existing Siemens 3VA panel cutouts and busbar systems. No rewiring needed if replacing a same-frame 3VA breaker; the lug spacing and mounting hole pattern are consistent across the 3VA family at this amp rating. That covers unheated warehouses and outdoor enclosures in most climates, though the 122.7 W dissipation means you'll want ventilation or forced air if the ambient regularly exceeds 50 °C and the breaker is continuously loaded near 500 A.