The Siemens 3VA2450-7MN32-0JA0 is a SENTRON molded case circuit breaker (MCCB) in a motor protection configuration, rated for a continuous current of 500 A across ambient temperatures from 40 °C to 50 °C — no derating needed in that range. At 55 °C it carries 495 A, and at 70 °C still holds 480 A, so it handles warm enclosures without a frame size jump. Breaking capacity is the headline: 330 kA at 240 V, 242 kA at 415 V and 440 V, and 52.5 kA at 690 V. That puts it in the high-interrupting category — sized for large transformer secondaries or bus feeds where fault current runs high. The overcurrent release is an ETU350M electronic trip unit, and the breaker includes phase failure detection and a shunt trip (STL) auxiliary release. No auxiliary contacts, no ground-fault monitoring, no communication module on this variant — it is a straight motor-protection MCCB with undervoltage release absent.
Panel fit and footprint
The case measures 138 mm wide, 248 mm high, and 110 mm deep — a standard SENTRON 3VA2 frame footprint. Front IP40 protection keeps out tools and fingers; the back and sides rely on the enclosure. The basic switch core is order code 3VA2450-7MN32-0AA0, and the integrated shunt trip is 3VA9688-0BL32, so replacement or spare-part ordering is direct.