The Siemens 5SU9356-7KP10 is a SENTRON RCD-operated circuit breaker — an RCBO combining overcurrent protection and residual current detection in a single 2-module (36 mm wide) package.
Energy limiting class 3 means it lets through minimal let-through energy during a fault, which helps downstream selectivity.
Rated 10 A at 30 °C ambient, the continuous current derates to 9.4 A at 40 °C, 9.1 A at 45 °C, 8.7 A at 50 °C, and 8.1 A at 55 °C. In a sealed enclosure or near heat-generating gear, the 45 °C limit is the governing constraint — above that, the derating curve applies and the 45 °C max ambient must not be exceeded.
Width 36 mm (2 width units), depth 77 mm, installation depth 70 mm. Conductor cross-section range 0.75 to 35 mm² for both solid and stranded — covers everything from 1.5 mm² lighting circuits up to 10 mm² feeder tails. Touch protection is integrated on the busbar side.