The XT5NU330ABFN000XXX: The TMA trip unit covers a 300 to 3000 A adjustable range, which means you set the continuous current rating to match your load — typically a large motor, transformer, or feeder circuit — rather than swapping breaker frames. The 3-pole configuration is standard for three-phase power distribution.
Deployment context
This is a panel-mount molded case circuit breaker, typically installed in switchboards, motor control centers, or distribution panels. The FF UL suffix indicates it meets UL 489 requirements for branch-circuit protection in North American installations. The adjustable TMA trip allows coordination with downstream breakers without swapping fixed-trip units.