What this 500 A MCCB does in a motor circuit
The Siemens 3VA2450-7MN32-0AC0 is a 3-pole molded case circuit breaker from the SENTRON family, rated 500 A continuous current across 40–50 °C ambient — it holds full rating up to 50 °C before the first derate step at 55 °C (495 A). That thermal stability makes it a solid pick for a warm panel in a motor control center where smaller breakers would already be downrating. It carries a motor protection designation, meaning the ETU350M electronic trip unit is configured for the inrush and overload profile of induction motors — not just thermal-magnetic instantaneous-only.
Interrupting capacity — where the headroom matters
The interrupting ratings span the common industrial voltages: 330 kA at 240 V AC, 242 kA at 415 V and 440 V, and 52.5 kA at 690 V. That simplifies coordination in a main lug or main breaker panel.
Dimensions are 248 mm height, 138 mm width, 110 mm depth — a standard 3-pole frame size for the 3VA2 platform.