The ABB XT4NU3250AAA000XXX is a 2-pole molded case circuit breaker from the XT4N 250 TMF series, rated at 20 A. The 2-pole configuration means it switches both line conductors simultaneously, typical for single-phase or two-wire DC circuits where overcurrent protection on both poles is required.
The XT5NU340ABNF000XXX is a 3-pole, 400 A MCCB on the larger XT5 frame. The XT4NU3250AAA000XXX at 20 A / 2 poles serves smaller loads.
Deployment context
As a molded case breaker, the XT4NU3250AAA000XXX mounts into a panel or enclosure via its fixed or plug-in base, connecting to busbars or cable lugs. It provides overcurrent and short-circuit protection for downstream loads — typical applications include distribution subpanels, lighting circuits, or small motor branch circuits within industrial control panels.