What the ratings mean for fit
The XT4NU3150DGG0B0XXX: The 150 A frame and 3000 A interrupting capacity (IM=3000) define its role as a main or feeder breaker in a 480 V panel. The UL/CSA listing means it meets North American code requirements for branch-circuit protection. The 3-pole configuration suits three-phase loads — motors, transformers, or distribution buswork.