The Siemens SENTRON 5SU9304-0KK16 is an RCD-operated circuit breaker — an RCBO — combining overcurrent protection and 30 mA residual-current protection in a single 18 mm-wide module. The 30 mA residual trip covers personnel protection (indirect contact) and fire prevention in standard AC circuits.
Deployment context
IP20 applies only when the board is closed and conductors are connected — not for open-panel or wet-area use. Rated for any mounting position, so orientation in a crowded enclosure is flexible.
Rated 16 A at 30 °C ambient; at 40 °C the continuous current drops to 15.04 A, at 50 °C to 13.92 A, and at 55 °C to 12.96 A. If the distribution board runs warm — near other breakers or in a sealed enclosure — the 40 °C or 50 °C row is the one that governs the load you can actually protect. The unit survives -40 °C storage and 75 °C maximum, but the operating derating curve is what matters for continuous load.
Listed as current-production (active lifecycle).