The Siemens 5SU9356-1KN50 is a 2-pole RCD-operated circuit breaker (RCBO) from the SENTRON family, combining overcurrent protection and residual current detection in one 36 mm-wide module.
Derate to 47.5 A at 40 °C, 46.5 A at 45 °C, 45 A at 50 °C, and 43.5 A at 55 °C — important when the breaker sits in a crowded enclosure with other heat sources.
Depth is 77 mm (70 mm installation depth), height 90 mm. IP20 rating applies when installed in a distribution board with conductors connected. Touch protection is built in. Halogen-free and silicon-free construction suits environments sensitive to outgassing — clean rooms, medical facilities, or telecom shelters.