On a DIN-rail panel, the 4-pole format occupies four module widths and fits the standard 35 mm rail, so it swaps into existing Siemens 5SY distribution boards or any 4-pole slot in a commercial panel.
Snap-on DIN-rail mount for 35 mm rail. The D-curve 2 A rating makes it a natural fit for protecting a small motor circuit (e.g., a fractional-horsepower fan or pump) or a control transformer primary where the inrush exceeds C-curve tolerance. Verify the load's starting current profile against the 10–20× In magnetic trip band to confirm no nuisance tripping on the first cycle.