What this MCCB carries
The Siemens SENTRON 3VA2450-7MN32-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for 500 A continuous at 40 °C, with a maximum breaking capacity of 330 kA at 240 V AC — that figure drops to 242 kA at 415 V and 187 kA at 500 V, so selectivity studies need the actual fault level at the point of installation. Rated current holds flat at 500 A up to 50 °C ambient, then derates to 495 A at 55 °C and 480 A at 70 °C — useful if the breaker sits in a warm enclosure near other heat sources. This variant is explicitly designed for motor protection (not just feeder protection), with phase failure detection built in and a shunt trip (STL) release plus two HQ auxiliary switches for remote status feedback.
Dimensions and panel fit
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON panel-mount cutouts without re-drilling.
Key ratings and what they mean
Maximum power loss is 99 W — relevant for enclosure thermal calculations and ventilation sizing. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C, covering most indoor and sheltered outdoor installations. The short-time withstand rating is 6 kA limited to 1 second — coordination engineers need this for downstream selectivity with smaller breakers.