The Siemens 5SU1354-0LB13 is a SENTRON RCBO — a combined residual-current and overcurrent protective device — in a 1P+N configuration, meaning it switches the line conductor and monitors the neutral for ground faults while providing overcurrent protection on the line side only.
Above that, the device derates: 12.48 A at 40 °C, 12.22 A at 45 °C, 11.96 A at 50 °C, 11.57 A at 55 °C, 11.31 A at 60 °C, 10.53 A at 65 °C, and 10.01 A at 70 °C. The fault-current type is AC-only (senses sinusoidal residual currents). For pulsating DC or smooth DC fault currents, a type A or type B RCBO would be needed. Energy limiting class 3 indicates it lets through less let-through energy (I²t) than class 1 or 2 devices, reducing stress on downstream cables and components during a fault.
It accepts solid or stranded conductors from 0.75 mm² up to 35 mm² — covering everything from 1.5 mm² lighting circuits to 10 mm² feeder tails. The supply can enter from either top or bottom, which simplifies busbar routing in a crowded distribution board. IP20 with the distribution board installed and conductors connected; the front face is finger-safe only when the board cover is closed. Mounting position is any — the device operates correctly upright, sideways, or inverted, which helps when the DIN rail is oriented vertically.
The RCBO is designed to EN 60898 (the European standard for circuit-breakers for overcurrent protection in household and similar installations) and carries the CE marking. The device is classified per DIN EN 61346-2 and DIN EN 81346-2 as function code F (protective device). The minimum test voltage for the integral test circuit is 195 V AC — the test button will not operate correctly below that line voltage.