It carries a 121 kA interrupting capacity at 240 V AC, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V — figures that tell you this breaker handles high-fault locations like transformer secondaries or main feeders without cascading upstream.
At 415 V the breaker still clears 75.6 kA, and at 440 V it manages 52.5 kA — enough for most North American 480Y/277 V and European 400 V distribution. At 500 V and 690 V it holds 11.9 kA, so it stays viable for 690 V industrial networks with moderate fault levels.
The thermal curve holds flat to 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C.
Auxiliary and release configuration
The UVR ensures the breaker drops out on voltage loss — typical for safety circuits or motor feeder coordination. The trip alarm gives a dedicated signal for remote fault indication, separate from the aux position feedback.