Its 63 A rating at 40 °C means it handles continuous current up to that level without nuisance tripping in a typical 40 °C panel ambient — derate to 58 A at 70 °C if your enclosure runs hot. Four poles let it switch three-phase loads plus the neutral, common for 3-phase 4-wire systems in commercial or light industrial distribution. Interrupting capacity tells you how big a fault it can safely clear: 52.5 kA at 240 V, 32 kA at 415 V, and 7.5 kA at 690 V. That 52.5 kA figure at 240 V is high enough for most service-entrance or sub-feed applications on a 240 V delta or 277/480 V wye system (line-to-ground fault).
Fit and integration — panel space and wiring
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — that's a 4-inch wide body, so it occupies one standard MCCB mounting slot. The 70 mm depth means it clears a typical 200 mm deep enclosure without the cover bulging. No DIN-rail mount here; this is a bolt-on or plug-in base for a SENTRON panelboard or standalone enclosure. Comes with an undervoltage release (UVR) built in plus two auxiliary switches and one trip-alarm switch. The UVR drops the breaker if control voltage falls below its dropout threshold — useful for safety circuits or remote shunt-trip schemes.