30 A thermal-magnetic fixed trip in the Tmax XT1N frame
The ABB XT1NQ3030AAA000XXX is a 30 A, 3-pole molded case circuit breaker in the Tmax XT1N 125 A frame, with a fixed thermal-magnetic trip unit. The 30 A rating means it protects a circuit whose continuous load stays at or below 30 A — sized for a 30 A feeder or a motor branch circuit where the full-load current lands under that mark. The fixed trip eliminates adjustment points, so what you spec is what you get; no field-calibration drift. Rated 600Y/347 VAC with an interrupting capacity of 18 kAIC, this MCCB handles fault currents up to 18 kA at that voltage without losing its integrity. The 480 VAC line-to-line rating covers common North American 480Y/277 V wye systems. The UL 100% rating means it can carry its full 30 A continuously without derating — a real advantage in a packed panel where ambient heat builds.
Panel-mount integration and frame notes
Panel-mounted, not DIN-rail — the XT1N frame bolts into a cutout or mounts on a backplate. The fixed front flat terminals accept standard lug or bus-bar connections; torque them to the manufacturer's spec for the 30 A path. The 125 A frame size gives mechanical headroom: the same physical breaker can be ordered with higher trip ratings, so the mounting footprint stays consistent across a panel's MCCB lineup.