The Siemens 3VA2450-5MN32-0BE0 is a 3-pole IEC frame 630 molded-case circuit breaker with a 500 A continuous current rating and a breaking capacity of 55 kA at 415 V (class M). It carries the ETU350M electronic trip unit with LSI protection — long-time (Ir adjustable 200–500 A), short-time (Isd 3–15 x Ir), and instantaneous (Ii fixed at 15 x In). The unit also ships with an undervoltage release (24 V DC) and a nut keeper kit, both factory-fitted.
What the ratings mean for your panel
The 55 kA Icu at 415 V is the maximum fault current this breaker can interrupt. The ETU350M LSI curve is for motor protection: adjustable Ir matches motor FLA, Isd provides selectivity, and Ii at 15 x In clears hard faults. The undervoltage release drops the breaker below 24 V DC for emergency-stop chains.