What the ratings mean for fit
The XT2SU3100FBBB00XXX: The 100 A rating on the EKIPLSI trip unit is the continuous current the breaker carries without tripping under normal conditions. The XT2S 125 frame supports up to 125 A, so this 100 A setting leaves headroom for coordination with downstream loads. The EKIPLSI is an electronic trip unit — it provides adjustable overload and short-circuit protection curves, which matters when you need selectivity in a distribution panel or motor control center. The 3-pole configuration suits three-phase power distribution, typical for feeding branch circuits in industrial switchgear.