The XT4NU3125AFF000XXX: The 250 A frame size means the breaker's physical housing and bus connections are rated for continuous currents up to 250 A, but the TMF trip unit's adjustable range of 125–1250 A lets you set the actual overload and short-circuit protection threshold within that band. The '3P F F' designation indicates three poles, fixed mounting (not plug-in or drawout), and fixed front terminals — so it bolts directly to a busbar or cable lug in a panel, with no accessory cradle.
ABB XT4NU3125AFF000XXX XT4N 250A TMF MCCB, 3P F F UL/CSA
MPNXT4NU3125AFF000XXX
ABB XT4N series, XT4NU3125AFF000XXX, 250 A frame TMF 125-1250 A, 3-pole, fixed, fixed, UL/CSA molded case circuit breaker.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
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Frequently asked questions
What does the description XT4N 250 TMF 125-1250 3P F F UL/CSA mean?
It decodes as: XT4N series, 250 A frame, TMF (thermal-magnetic fixed) trip unit adjustable 125–1250 A, 3-pole, fixed mounting, fixed front terminals, UL/CSA certified.
Where can I buy XT4NU3125AFF000XXX and get current pricing?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
MPN
XT4NU3125AFF000XXX