What this 4-pole MCCB carries
Its TM240 thermal-magnetic release is sized for 250 A continuous at 40 °C, and the breaker holds that rating through 50 °C before it starts to derate — 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. That thermal curve is the one that governs real panel loading; the breaker doesn't trip early if your enclosure runs warm, but you size the conductor and the enclosure ventilation for the temperature you actually see.
Breaking capacity — what it means for fault duty
This MCCB delivers 121 kA interrupting capacity at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V.
The 3VA1225-4EF42-0AF0 measures 140 mm wide, 158 mm tall, and 70 mm deep — a standard 4-pole MCCB footprint that fits SENTRON mounting plates and common DIN-rail adapter brackets.