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. That 187 kA figure at 240 V is the highest in this frame class — it lets you place this MCCB at the service entrance without needing a current-limiting fuse upstream. The continuous current holds at 250 A up to 50 °C ambient; above that it derates linearly to 225 A at 70 °C. Maximum power loss is 37.5 W, which matters for enclosure thermal calculations.
Trip unit and auxiliary contacts
The ETU350M electronic release provides adjustable overload and short-circuit protection with phase-failure detection — a requirement for motor circuits where single-phasing can burn out windings before a thermal relay reacts. The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HP type), giving you three separate signal paths for remote status: open/closed, tripped, and alarm. No undervoltage release or ground-fault monitoring is fitted, so if those functions are needed they must be added externally. Latching endurance is rated at 15 000 operations.
Mounting and environmental limits
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. The 138 mm width is the standard 3-pole MCCB footprint for this frame — it fits existing SENTRON panel layouts and busbar systems without adaptors. Front-face protection class is IP40, suitable for enclosed switchboards; the breaker is not rated for washdown or outdoor exposure. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.