That interrupt rating makes it suitable for high-fault installations where upstream coordination demands a robust device.
Trip Curve D and deployment context
Trip Curve D means the magnetic trip operates between 10× and 20× rated current (200 A to 400 A for this 20 A unit). This delayed magnetic response is sized for loads with high inrush — motor starters, transformers, welding equipment — where a B- or C-curve would nuisance-trip on startup. The 4-pole configuration covers three-phase plus neutral, so it fits three-phase distribution panels feeding motor control centers or industrial machinery. Per the datasheet, the S800S series is designed for selective coordination in commercial and industrial switchboards.