The 76.2 mm width (roughly 3 inches) and 130 mm height let it drop into a standard panel footprint without surprises; the 70 mm depth keeps it clear of gland plates in shallow enclosures.
This breaker delivers 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V. For a 480 V panel (common in North American industrial distribution), the 415 V figure is the closest reference — 52.5 kA gives substantial headroom above a typical 25 kA or 42 kA available fault current. At 690 V the 10.5 kA rating still covers most European industrial grids.
Thermal derating — don't size by the nameplate alone
Above that it steps down: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If the breaker lives in a crowded panel or near heat-generating gear, use the 55 °C or 60 °C row for sizing — the 50 A nameplate is only valid up to 50 °C.