This breaker delivers 121 kA breaking capacity at 240 V, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For a 480 V panel (common in North America), the relevant figure is the 440 V rating — 52.5 kA — which is the closest standard voltage below 480 V in the table.
Thermal derating — when 40 A is not 40 A
At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. The insulation voltage rating is 800 V, which covers most low-voltage distribution networks up to 690 V phase-to-phase.
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures.