The LS/I configuration gives you long-time and instantaneous protection — a standard combination for feeder or main breaker duty in distribution panels where selective coordination with downstream devices matters. The EKIP DIP trip unit is field-adjustable, so you can dial in the long-time pickup and delay to match your cable and transformer protection curves without swapping the breaker.
The full description string — XT5H 600 EKIP DIP LS/I 600 3P FF UL/CSA — decodes to a 600 A frame, three-pole, fixed-front (FF) construction, with the EKIP DIP LS/I trip unit. The FF designation means the breaker's front cover is non-removable in the field, which is standard for this class of molded case breaker and keeps the internal arc chamber sealed. The EKIP DIP family uses a rotary dial interface for setting the long-time pickup (Ir) and instantaneous pickup (Ii); no external power supply is needed for the trip unit — it's self-powered from the line-side current transformers.