If a PCN arrives, the manufacturer typically provides a form-fit-function replacement within the same 5SY4 family, but as of now no successor has been announced.
The 4-pole width occupies 4 module spaces (72 mm at 18 mm per pole). Terminals accept copper conductors up to 25 mm² for the line and load sides; torque to the nameplate value (typically 2.5–3.0 Nm for this class). When grouping multiple breakers in an enclosure, account for the thermal derating: the 2 A C-curve is calibrated for an ambient of 30 °C. Above that, the continuous current rating must be reduced per the manufacturer's derating curve — a detail often missed during panel layout that can cause nuisance tripping on a warm summer day.