MCCB for panel protection
The ABB XT1NU3110AFF00NXXX is a 3-pole molded case circuit breaker from the XT1N family, rated on a 125 A frame with a TMF 110-1100 A thermal-magnetic trip unit. The trip block covers adjustable overload and fixed short-circuit protection from 110 A up to 1100 A, letting you set the continuous current to match the downstream cable or load without swapping the breaker body. Line and load lugs are standard — F F in the order code means front-connect lugs on both ends, so it lands directly on busbars or cable sets in a panelboard or switchboard without add-on kits.
The 125 A frame size keeps the footprint compact for multi-breaker layouts. UL and CSA listed — the breaker carries those marks for North American installations. RoHS and REACH declarations are available from ABB on request.