The Siemens SENTRON 5SU9304-7KX06 is an RCD-operated circuit breaker — an RCBO — combining overcurrent protection and residual current detection in a single 18 mm wide module. The breaking capacity is 10 kA per both EN 60898 and IEC 60947-2, so it safely interrupts fault currents up to that level in a 110/120 V AC circuit.
The 6 A rating at 30 °C derates to 5.7 A at 40 °C and 5.16 A at 55 °C — if the panel ambient runs hot, the continuous load must stay under the derated figure. The C-curve trips at 5–10× rated current, so it suits mixed resistive-inductive loads like small pumps or control transformers.
It mounts in any position, which helps when filling a crowded enclosure. The IP20 rating applies to the device alone; with the distribution board installed and conductors connected, IP40 is achieved.