The Siemens 5SV9316-7NK20 is a SENTRON RCBO — an RCD-operated circuit breaker that combines overcurrent protection and residual current detection in a single 18 mm wide module. The breaking capacity is 6 kA per EN 60898 and IEC 60947-2, which means it can safely interrupt fault currents up to that level in a 230/400 V AC circuit without upstream damage.
Ratings that matter for the panel
Derate to 19 A at 40 °C, 18.4 A at 45 °C, 18 A at 50 °C, and 17.4 A at 55 °C — the full thermal curve is defined, so you can size the branch circuit without guesswork. Maximum power dissipation is 3.8 W, which adds to the enclosure thermal budget. Wire range accepts 0.75 to 16 mm² solid or stranded. That covers most panel wiring from control circuits to feeder taps.