MCCB with motor protection and high breaking capacity
The Siemens SENTRON 3VA2325-7MN32-0JA0 is a 3-pole molded case circuit breaker rated for motor protection duty, carrying a rated continuous current Iu of 250 A and a rated insulation voltage Ui of 800 V. It is equipped with an ETU350M electronic overcurrent release and an integrated shunt trip (STL) auxiliary release. The breaker's breaking capacity reaches 330 kA at 240 V and 242 kA at 415 V, making it suitable for high-fault-current industrial distribution.
Breaking capacity across voltage levels
Breaking capacity is rated per voltage: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. These figures certify the breaker's ability to safely interrupt fault currents up to those levels without cascading upstream — critical for coordination studies in high-capacity switchboards.
Thermal derating and operating range
Rated continuous current holds at 250 A from 40 °C through 50 °C ambient, then derates to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. Minimum operating temperature is -25 °C; maximum is 70 °C. Storage range extends from -40 °C to 80 °C. Maximum power loss is 37.5 W.
Integration and mounting dimensions
Panel cutout dimensions: width 138 mm, height 248 mm, depth 110 mm. The 3-pole form factor fits standard Siemens SENTRON mounting bases. No auxiliary contacts are fitted as standard; the auxiliary contact version is listed as without. Phase failure detection is built in.