It sits in the panel as the main or branch-circuit protective device, sized for distribution and motor-circuit duty where a thermal-magnetic trip unit provides overload and short-circuit protection.
Key rating and what it means
Three poles means this breaker switches and protects all three phases of a three-phase system — the standard configuration for 400 V / 480 V industrial power distribution. The 3-pole count confirms it is not a 1- or 2-pole variant; it is the right fit for a three-phase line-up where phase loss protection on all conductors is required.
Deployment context
The 3-pole footprint matches the typical 3-phase busbar pitch; verify the busbar center-to-center spacing against the existing panel layout before committing the cutout.