The Siemens 5SV1316-6LK13 is a SENTRON RCBO — a combined residual-current and overcurrent protective device — in a 1-pole+N configuration (switching the line, monitoring the neutral) that fits a single 18 mm modular-width slot on a DIN rail.
Energy limitation class 3 means the RCBO lets through relatively low let-through energy during a fault, which helps achieve selectivity with upstream devices and reduces stress on downstream wiring.
Thermal derating and installation constraints
The 13 A rating is at 30 °C ambient; the device must be derated in warmer enclosures — at 40 °C it carries 12.35 A, at 50 °C it carries 11.57 A, and at 70 °C it carries 10.01 A. This derating curve is built into the design and should be applied when grouping multiple RCBOs in a panel to avoid nuisance tripping from internal heat buildup. IP20 protection applies when installed in a distribution board with conductors connected — the device itself is not sealed against dust ingress or moisture, so it must live inside a closed enclosure.