The ABB XT4NU3125BFF000XXX is a three-pole molded-case circuit breaker from the XT4N family, fitted with a TMA 125 thermal-magnetic trip unit and housed in a 250 A frame. The description string — XT4N 250TMA 125 625-1250 3PFFUL/CSA — decodes as: XT4N series, 250 A frame, TMA trip unit set at 125 A, with a 625–1250 A short-circuit magnetic trip range, three-pole, front-face terminals, UL and CSA certified. That magnetic trip range means the instantaneous pickup is adjustable between roughly 5× and 10× the 125 A rating, letting you coordinate with downstream breakers or motor-starting inrush without nuisance tripping.
ABB XT4NU3125BFF000XXX XT4N 250A TMA 125A MCCB, current
MPNXT4NU3125BFF000XXX
ABB XT4N series, TMA 125A thermal-magnetic trip, 250A frame, 3-pole, UL/CSA, order code XT4NU3125BFF000XXX.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
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Frequently asked questions
Where can I buy XT4NU3125BFF000XXX and get a price?
This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time.
What does the description XT4N 250TMA 125 625-1250 3PFFUL/CSA mean?
It specifies an XT4N series MCCB with a 250 A frame, a TMA thermal-magnetic trip unit rated 125 A, a magnetic trip range of 625–1250 A, three poles, front-face terminals, and UL/CSA certification.
MPN
XT4NU3125BFF000XXX