What this MCCB delivers
The Siemens SENTRON 3VA2450-7MN32-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current of 500 A, with an interrupting capacity of 330 kA at 240 V, 242 kA at 415 V and 440 V, and 52.5 kA at 690 V. It carries the ETU350M electronic trip unit, configured for motor protection — meaning it tracks phase failure and thermal overload, not just short-circuit clearing. The front face carries IP40 protection, so it's suited for enclosed panel mounting where dust ingress is controlled.
Ratings and what they mean for the panel
Rated continuous current Iu of 500 A holds flat from 40 °C through 50 °C — no derating needed in a typical 40 °C panel ambient. At 55 °C it drops to 495 A, at 60 °C to 490 A, at 65 °C to 485 A, and at 70 °C to 480 A. That thermal curve is the one to check if the breaker sits near a heat source or in a sealed enclosure with limited convection. The ETU350M release is an electronic trip unit — no thermal bimetal, so ambient temperature compensation is built in. Phase failure detection is standard, which is the main reason you'd pick this over a basic thermal-magnetic MCCB for motor branch circuits. No undervoltage release, no shunt trip, no ground-fault module on this variant; those are add-on options if needed. Dimensions are 248 mm high, 138 mm wide, 110 mm deep. That depth is the body only — allow extra for the auxiliary switch wiring (2 HP auxiliary switches are fitted) and for the arc-chamber clearance per IEC 60947-2. The reference code per DIN EN 81346-2 is Q, which maps to the protective-device function in a standard panel schedule.