What it is and what the ratings mean
The Siemens 5SU1354-7RC16 is a SENTRON-series RCBO — a combined residual-current device (RCD) and miniature circuit breaker (MCB) in one 2-module-wide (36 mm) package. It's rated 16 A with a C tripping characteristic, which means it's designed for moderate inrush loads like small motors, pumps, and lighting banks where the startup surge is 5–10 times the rated current. The 30 mA Type A residual-current element catches both sinusoidal AC fault currents and pulsating DC fault currents — the kind you get from single-phase rectifiers in VFDs, switch-mode supplies, and LED drivers. That Type A rating is what makes this unit a step up from a basic AC-type RCD: if your panel feeds any electronic load, Type A is the minimum you'd spec.
Breaking capacity and selectivity
This RCBO carries two breaking-capacity ratings: 10 kA per EN 60898 and 20 kA per IEC 60947-2. The EN 60898 number is the one you use for residential and light commercial distribution boards; the IEC 60947-2 rating applies when the unit is installed in an industrial panel where the prospective fault current is higher. Either way, the 20 kA figure gives you headroom for most 400 V industrial sub-distribution boards without needing a current-limiting upstream fuse. The energy limitation class is 3 — meaning it limits let-through energy enough to protect downstream wiring and terminals in a fault event.
Mounting and panel fit
Snaps onto standard 35 mm DIN rail, 2 modular width units (36 mm wide). Mounting position is unrestricted — horizontal, vertical, upside-down, doesn't matter. Depth is 70 mm from the rail face, which is the standard SENTRON depth; it sits flush alongside 5SL-series MCBs in the same distribution board. The neutral conductor is switched internally, so you don't need a separate neutral bar or a 4-pole unit for single-phase circuits that require neutral isolation. Touch protection is built in: the live terminals are shrouded once the conductors are connected.