Breaking capacity is the headline: 187 kA at 240 V, 121 kA at 415/440 V, 79 kA at 500 V, and 5.1 kA at 690 V. The temperature derating matters for real-world panel loading: full 250 A is available up to 50 °C ambient. At 55 °C it drops to 238 A, at 60 °C to 225 A, at 65 °C to 213 A, and at 70 °C to 213 A. If your enclosure runs hot, size the load accordingly — do not spec it at 250 A in a 65 °C panel.
Trip unit and auxiliary configuration
Overcurrent protection is handled by the ETU560 electronic trip unit, which supports adjustable long-time, short-time, instantaneous, and ground-fault settings. Ground-fault detection uses summation current formation on the L-conductor — it sums the phase currents and trips on residual imbalance, not a separate neutral CT. A shunt trip (STL) release is integrated for remote tripping via a control signal. The supplied basic switch is order code 3VA2225-5JQ32-0AA0; the integrated auxiliary trip module is 3VA9688-0BL32. Communication function is present, enabling integration with a BMS or PLC for power monitoring and remote status. No undervoltage release or phase-failure detection is built in — those would be external additions if required.