Its interrupting capacity hits 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — numbers that place it squarely in high-fault-duty distribution, not branch-circuit light duty. At 690 V it still clears 17 kA, so it handles the step-down transformer secondary in a 690 V industrial grid without cascading upstream. It measures 130 mm high, 76.2 mm wide, and 70 mm deep — a compact footprint for a breaker that clears 220 kA.
Thermal derating — the real continuous current
At 55 °C it derates to 76.8 A, at 60 °C to 75.2 A, at 65 °C to 73.6 A, and at 70 °C to 72 A.
The 76.2 mm width fits standard MCCB mounting footprints in distribution panels. Depth of 70 mm leaves clearance for rear-connected bus bars or cable lugs.