Siemens SENTRON 5SL6506-8CC — 6 A D-Curve MCB for High-Inrush Loads
The D-curve (10–20× In magnetic trip) means it tolerates the starting surge of a small pump or compressor without nuisance tripping, unlike a B or C curve that would drop out on the same load.
The 6 A rating at 30 °C is the base thermal current; at elevated ambient temperatures inside a crowded enclosure the breaker must be derated — 5.53 A at 40 °C, 5.28 A at 45 °C, 5.02 A at 50 °C, and 4.75 A at 55 °C (–). If your panel ambient runs 50 °C, plan for a 5 A continuous load maximum on this pole. The 1P+N construction switches the line conductor and disconnects the neutral, which is typical for single-phase final circuits in IEC distribution boards; the neutral pole is not overload-protected, only switched. The D-curve trips magnetically between 60 A and 120 A, so it will hold through the 40–50 A starting draw of a 1.5 kW single-phase motor but clears quickly on a hard short.