The ABB XT5NU360BFYN000XXX is a NEXT5N 600 molded case circuit breaker with an EKIP DIP LSI electronic trip unit, rated at IN600 and configured as a 3-pole unit with FF (fixed front) terminals and UL/C certification.
The IN600 frame rating indicates the breaker's continuous current-carrying capacity at 600 A in a 40 °C ambient. The EKIP DIP LSI trip unit provides electronic protection with L (long-time delay), S (short-time delay), and I (instantaneous) functions — adjustable via DIP switches on the front face, which means you can coordinate selectively with downstream breakers without swapping trip units. The 3-pole FF (fixed front) terminal configuration suits panel-mount installations where the breaker bolts directly to busbars or cable lugs.
Molded case circuit breakers of this class serve as main or feeder protection in switchboards, motor control centers, and distribution panels. The UL/C dual listing covers installations in both US (UL 489) and Canadian (CSA C22.2 No. 5) jurisdictions, so it fits North American panel builds without a separate certification review.