The 3-pole form factor with FF (fixed front terminals) suits panel layouts where the breaker is a fixed feeder — no plug-in base required. The TMA trip unit's adjustable band (400-4000 A) lets you match the breaker to the actual load without changing the frame, which simplifies stocking: one frame size covers a wide range of downstream protection settings.
ABB XT5NU340ABFF000XXX XT5N 400A 3P MCCB, TMA Trip, UL Liste
MPNXT5NU340ABFF000XXX
ABB XT5N series, XT5NU340ABFF000XXX, 3-pole molded case circuit breaker, 400A frame, TMA 400-4000A thermal-magnetic adjustable trip unit, UL listed.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Product details
Frequently asked questions
What is XT5NU340ABFF000XXX's listed description?
The description is XT5N 400 TMA 400-4000 3P FF UL, indicating a 3-pole XT5N frame breaker with a TMA adjustable thermal-magnetic trip unit rated 400-4000 A, fixed front terminals, and UL listing.
Where can I buy XT5NU340ABFF000XXX?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
What compliance documentation does ABB provide for XT5NU340ABFF000XXX?
The UL listing is documented in the part description. For RoHS, REACH, and IEC compliance documentation, ABB typically provides declarations on request through the distribution channel.
MPN
XT5NU340ABFF000XXX