What this 250 A MCCB does on your line
The Siemens 3VA2325-7JQ32-0AA0 is a SENTRON molded case circuit breaker rated for 250 A continuous at 40 °C through 70 °C — no derating needed across that range, which is unusual and simplifies panel thermal budgeting. It carries a 3-pole configuration with an ETU560 electronic trip unit, designed for line protection duty — meaning it protects cables and busbars, not motor overloads. The ETU560 gives you adjustable long-time, short-time, and instantaneous pickup settings plus ground-fault protection via summation current sensing on the L-conductor. Interrupting capacity hits 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 7.5 kA at 690 V — that 330 kA figure tells you this breaker is built for high-fault utility feeds or transformer secondaries where available fault current is extreme. The front face carries an IP40 protection class, so it's protected against tools and wires >1 mm but not sealed against moisture — standard for a panel-mounted MCCB in a clean indoor switchboard.
Panel fit and integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — the 110 mm depth is shallow enough to fit most standard distribution panels without a deep enclosure extension. The 138 mm width is the standard 3-pole MCCB footprint for this frame size. A motor drive option is available as an optional extension, and the breaker supports communication functions — so you can integrate it into a BMS or SCADA system for remote trip indication and monitoring.
What the ETU560 trip unit gives you
The ETU560 is an electronic trip unit with LSI protection curves — long-time delay, short-time delay, and instantaneous — plus ground-fault alarm or trip. It's field-adjustable via the front rotary dials and DIP switches, so you can coordinate selectively with downstream breakers without swapping trip units. Power loss is 37.5 W maximum at rated current — that's the heat you need to vent from the enclosure. At 250 A continuous, that's reasonable for an electronic-trip MCCB of this frame size. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. The 70 °C operating max matches the full-current rating — no derating curve to chase for high-ambient panels.