Thermal memory means the breaker remembers prior heating and reduces re-closing time after a trip — useful on solar strings where repeated faults can stress equipment. For a 400 V system the interrupting rating is higher; coordination studies should use the full I²t curves. The breaker is Category A (no intentional short-time delay), so it clears fast — typical for distribution feeders, not main incomers requiring selectivity with downstream breakers. Rated insulation voltage is 1250 V AC, and operational voltage is 800 V AC — both per EN/IEC 60947-2.
Fixed-mount breaker with backplate mounting support. Accepts horizontal or vertical orientation. Connection pitch is 40 mm — standard for this frame size. Dimensions: 205 mm high, 120 mm wide, 105 mm deep. IP20 finger-safe terminals; install inside a panel with a higher enclosure rating for washdown environments.
Durability and environment
Mechanical durability is 20,000 cycles; electrical durability is 4,000 cycles at 800 V In. Power dissipation per pole is 18 W — at 250 A load, total heat is 54 W across three poles; account for this in enclosure thermal calculations. Storage temperature range is -35 to 85 °C. Operating altitude: 0–2000 m without derating, 2000–5000 m with derating.