It carries 50 A continuously at 40 °C and can interrupt up to 75.6 kA at 240 V AC — enough for high-fault utility feeds or transformer secondaries. The 70 mm depth and 76.2 mm width match the standard 3VA mounting footprint — drops into the same panel cutout as other 3VA three-pole frames without re-drilling.
Ratings that govern the real application
The 50 A rating holds flat from 40 °C through 50 °C ambient, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. In a hot panel — say a poorly ventilated enclosure near a furnace line — expect to drop the continuous load to 45 A. The interrupting capacity steps down with voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V or 690 V. Coordination studies should use the voltage-specific SCCR, not the 240 V headline. Power loss is 14.6 W maximum — negligible for thermal budget in most enclosures, but worth noting if multiple breakers are ganged in a sealed box.