Siemens 3VA1450-4EE32-0AA0 — 500 A SENTRON MCCB, TM220 Release
The Siemens 3VA1450-4EE32-0AA0 is a 3-pole SENTRON molded case circuit breaker rated for a continuous current Iu of 500 A at ambient temperatures up to 50 °C, with no derating needed at 40 °C, 45 °C, or 50 °C. Above that, the current rating steps down to 488 A at 55 °C, 476 A at 60 °C, 464 A at 65 °C, and 452 A at 70 °C — useful to know if this breaker sits in a warm enclosure or near other heat sources. Breaking capacity runs 121 kA at 240 V, 75.6 kA at both 415 V and 440 V, 52.5 kA at 500 V, and 11.9 kA at 690 V. It carries a TM220 thermal-magnetic overcurrent release — that's a fixed, non-adjustable thermal trip with a magnetic short-circuit pickup set at the factory. It's a straight line-protection breaker: no bells, no auxiliary electronics.