The Siemens SENTRON 5SU1354-7FM16 is a 2-pole (1P+N) RCBO — a combined residual-current device and miniature circuit breaker in a single 36 mm wide unit, occupying 2 width units on the DIN rail. The Type A fault-current detection catches pulsating DC residual currents — the common profile from single-phase rectifiers, VFDs, and switching power supplies found on modern control panels. The energy limiting class 3 means it lets through less let-through energy during a fault, reducing stress on downstream wiring and connected equipment. Ambient temperature range of -25 to +55 °C, with a detailed derating curve from 30 °C (16 A) down to 12.32 A at 70 °C — useful if the RCBO sits in a warm enclosure or near other heat-generating devices. Mounting position is any, so vertical or horizontal DIN-rail orientation is acceptable.
Panel fit and wiring constraints
Dimensions are 36 mm wide, 90 mm high, 77 mm deep, with an installation depth of 70 mm — standard for a 2-module DIN-rail device. Protection class IP20 when installed in a distribution board with connected conductors — this is an enclosure-rated device, not for open-panel or washdown locations. Supply can enter from either top or bottom, simplifying panel layout.