The ABB XT3NU3225AFA000XXX is a 3-pole molded case circuit breaker from the XT3N series, rated for 225 A continuous with a TMF (thermal-magnetic fixed) trip unit. It carries UL and CSA approvals, making it a direct fit for North American panelboards and switchgear where a 225 A frame is required. The lifecycle stage is listed as current, so this remains an active catalog number for new installations and BOM line items.
What the 225 A TMF Rating Means for Fit
The 225 A continuous rating on the XT3N frame sets the maximum uninterrupted current the breaker can carry without tripping under normal conditions. The TMF trip unit provides fixed thermal-magnetic protection: the thermal element responds to sustained overloads (inverse-time curve), while the magnetic element handles short-circuit events instantaneously. For a panel builder, this means the breaker is sized for a 225 A feeder or a large motor branch circuit where the full-load current stays at or below that value. The UL/CSA listing confirms it meets North American short-circuit current rating (SCCR) requirements for the specified interrupting capacity — verify the interrupting rating against the available fault current at the point of installation.
Sourcing and Lifecycle
The lifecycle stage is current, meaning ABB continues to manufacture and support this order code. It is available through independent distribution channels and is quoted to order against an RFQ. For volume or scheduled releases, confirm pricing and lead time at the time of quotation.