MCCB with ETU320 electronic trip unit — 250 A continuous, 3-pole line protection
Its ETU320 electronic overcurrent release provides adjustable thermal-magnetic or fully electronic protection curves, making it suitable for applications where coordination with downstream breakers is required — typical for main or feeder breaker positions in a 400 V or 480 V plant distribution. The 250 A rating holds at 40 °C, 45 °C, and 50 °C without derating; at 55 °C it still carries 241 A, and at 70 °C it carries 213 A — useful for panels in hot environments where ambient derating curves are a concern.
Lifecycle and sourcing — currently in active production
Because the part is current, the normal Siemens distribution channel supplies it; for procurement purposes it is specifiable into a new BOM without obsolescence risk. No PCN or EOL notice is on record for this order code. The part is qualifiable through Siemens' standard change-control documentation.
Integration — panel fit and wiring constraints
Mounting dimensions: 181 mm height, 105 mm width, 86 mm depth — a standard 3-pole MCCB footprint that fits most Siemens SENTRON panelboards and third-party enclosures with a 105 mm wide breaker cutout.