This is the part you need when the BOM calls for a 4-pole MCCB in the XT1 platform — the poles count is the first fit check, and this one carries four.
The 4-pole configuration means this breaker switches all three phases plus the neutral. In a panel, that saves an external neutral disconnect and keeps the coordination study clean — one device, one curve. The TMF trip unit gives a fixed thermal and magnetic setting, so it's a straight swap-in for a design that already calculated the cable and load protection around that curve.