The Siemens SENTRON 3VA2325-5MN32-0AJ0 is a 3-pole molded case circuit breaker (MCCB) rated for motor protection, carrying a continuous current Iu of 250 A at 40 °C and an interrupting capacity of 187 kA at 240 V — enough to handle high-fault utility feeds without cascading upstream. It uses an ETU350M electronic trip unit with phase-failure detection, so it can discriminate between a genuine overload and a lost phase on a motor circuit.
Interrupting and thermal performance
The interrupting rating scales with system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. Maximum power loss is 37.5 W, which matters for enclosure thermal calculations.
Trip unit and auxiliary contacts
Latching endurance is rated at 15 000 operations.