The Siemens SENTRON 3VA2450-7MN32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 500 A, with a motor protection designation and an ETU350M electronic trip unit. It carries a breaking capacity of 330 kA at 240 V, 242 kA at 415 V and 440 V, and 52.5 kA at 690 V — figures that cover most industrial fault-current scenarios from low-voltage distribution down to motor branch circuits.
Ratings and what they mean for the panel
The 500 A rating holds flat from 40 °C through 50 °C, then derates gradually to 480 A at 70 °C. That thermal curve means the breaker can sit in a warm enclosure without losing headroom until the ambient climbs above 55 °C — useful for a panel near a furnace line or in a non-conditioned electrical room. The ETU350M release is a microprocessor-based overcurrent trip designed for motor protection: it includes phase-failure detection and an adjustable time-current curve that coordinates with motor-start inrush without nuisance tripping. The undervoltage release (UVR) built into this variant drops the breaker when control voltage falls below a threshold, which is standard for safety circuits that need to guarantee a stopped state on power loss.
Integration and footprint
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a compact three-pole frame that fits standard Siemens SENTRON mounting plates and busbar systems. The IP40 front protection means it is splash-safe from the front but not sealed; install it in a panel with a door or cover for environments with dust or dripping water. Auxiliary contacts are included as 2 HQ switches, and the breaker ships with an undervoltage release (3VA9608-0BB25) pre-installed. No communication module or ground-fault monitoring is fitted on this variant — those are separate order options if the application needs them.