It's a line-protection breaker, meaning it's built for feeder and main distribution duties where you need to clear faults fast and keep selectivity downstream. The interrupting ratings tell the story: 220 kA at 240 V, 154 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V. At 415 V, the 154 kA still gives you plenty of headroom for most industrial switchboards.
Thermal performance and derating
At 55 °C it derates to 194 A, at 60 °C to 188 A, at 65 °C to 182 A, and at 70 °C to 176 A. That's a gentle slope — you lose only about 12% by 70 °C, which matters when you're packing breakers tight in a warm enclosure. The storage number governs handling and shipping, not running.
Auxiliaries and releases
Comes with an undervoltage release (UVR) already installed — that's the 'EF42' portion of the order code telling you it's factory-fitted. No ground-fault monitoring, no phase-failure detection, no communication module. This is a straight-ahead line-protection breaker — no frills, fewer things to fail. That's typical for an MCCB of this class — not a switching contactor, but plenty for infrequent manual operation and fault clearing.
The 140 mm width is the 4-pole frame footprint — it'll need a 4-module-wide space on the mounting plate.