What the 3-pole rating means for fit
The XT1NU3080AAA0A0XXX: Three poles means this breaker switches and protects all three phases of a 3-phase AC circuit. That covers the majority of industrial loads — motors, pumps, conveyors, lighting panels, and distribution sub-feeds. If your circuit is single-phase or two-phase, you'd be looking at a different pole count; for a standard 3-phase 400 V or 480 V panel, this is the expected configuration.