At 1 A rating, this is sized for a lightly loaded branch — think a control-circuit feed, a small power supply primary, or a single-phase auxiliary load, not a main incoming device.
In a typical Siemens ALPHA or SENTRON distribution board, it shares the same footprint as every other 5SY4-series MCB — no special adapter or busbar needed. The 2-pole configuration means it simultaneously breaks both phase and neutral (or both phases in a single-phase split system) on a fault. Terminal capacity accepts up to 25 mm² conductor; torque to the values printed on the device face.