ABB XT5NU340ABFN000XXX Molded Case Circuit Breaker

This XT5 breaker is designed for installation within ABB ReliaGear neXT panelboards, ReliaGear SB switchboards, and ABB SACE Tmax XT enclosures.

The factory installed lugs accommodate two conductors per phase, accepting either copper or aluminum wire sizes ranging from 2/0 AWG up to 500 kcmil.

This breaker uses an adjustable thermal magnetic trip unit with Long-Time (L) and Instantaneous (I) functions. Both the thermal overload and instantaneous short circuit thresholds can be adjusted in the field to coordinate with downstream loads.

The N indicates the normal interrupting capacity tier for the XT5 frame. This provides a maximum interrupting rating of 35kA at 480VAC and 65kA at 240VAC.

Yes. Because it features a thermal magnetic trip unit, this breaker is rated for direct current applications up to 600VDC, with a maximum interrupting capacity of 16kA.

Yes, ABB SACE Tmax XT molded case circuit breakers with thermal magnetic trip units can be reverse fed. Power can be supplied from the bottom terminals, as they do not have a marked line and load distinction. Always verify local electrical codes before installation.

Yes, the Tmax XT5 family supports a wide range of snap-in accessories. Auxiliary contacts, shunt trips, and undervoltage releases can be easily installed in the field to modify the breaker for specific control applications.

The breaker is designed to operate in ambient air temperatures between -25 degrees Celsius and +70 degrees Celsius. The reference temperature for the thermal trip unit is +40 degrees Celsius, and derating tables should be consulted for operation outside of this baseline.

Yes. The ABB Tmax XT5 series serves as the direct upgrade and replacement path for legacy GE Spectra G-frame breakers, including the 400A SGHA, SGLA, and SGPA models, when using the appropriate retrofit kits or panelboard hardware.