Rated 40 A continuous at 40 °C ambient, it holds that rating up to 50 °C before derating begins — at 55 °C it's 39 A, at 70 °C it's 37 A. That thermal curve matters if the breaker lives in a crowded, warm panel. Breaking capacity is the headline: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. Those figures tell you it handles high-fault-current scenarios at lower voltages — typical for North American 240/277 V distribution — and still clears moderate faults at 690 V industrial mains.
Built-in accessories and panel fit
Depth of 70 mm (2.76 in) is shallow enough for most distribution panels without gland-plate interference. The breaker is rated for indoor use in conditioned or unconditioned electrical rooms.