Product introduction
The ABB XT1NU3090AFF00NXXX is a three-pole molded case circuit breaker from the XT1N 125 frame, fitted with a TMF (thermal-magnetic fixed) trip unit adjustable from 90 A to 900 A. It carries UL and CSA certifications, making it a drop-in choice for North American panel builds, feeder protection, and motor branch circuits in industrial and commercial distribution.
Listed as current production.
Typical applications and environments
Designed for main or branch feeder protection in switchboards, panelboards, and motor control centers. The adjustable trip range covers motor loads and general distribution circuits.
What the adjustable trip range means for the BOM
A single XT1NU3090AFF00NXXX can be field-set to protect anything from a 90 A feeder to a 900 A bus — one SKU replaces what would otherwise be multiple fixed-trip breakers. For the MRO planner, that means fewer line-item SKUs on the shelf. For the panel builder, the TMF trip unit eliminates the need to order a separate trip module; the breaker ships complete.