The Siemens 5SU9356-7KP32 is a SENTRON RCD-operated circuit breaker — a combined overcurrent and residual-current device (RCBO) in a single 36 mm-wide, 2-module package. It's rated 32 A at 30 °C with a C tripping characteristic, meaning it handles moderate inrush from motor starters or capacitor banks without nuisance trips, while the 6 kA breaking capacity per EN 60898 (10 kA per IEC 60947-2) clears line-to-neutral faults up to that level. The Type A fault-current detection catches both sinusoidal AC and pulsating DC residual currents, which covers most modern electronic loads like VFDs and switched-mode power supplies.
The unit occupies 2 width units (36 mm) on a DIN rail, with an installation depth of 70 mm and overall depth of 77 mm — fits standard 80 mm-deep enclosures. Mounting position is unrestricted, and the supply can enter from either top or bottom, which simplifies panel layout when busbar routing dictates the feed direction. Terminals accept solid or stranded conductors from 0.75 mm² up to 35 mm², covering everything from 1.5 mm² lighting circuits up to 10 mm² feeder tails. The max power loss of 1.5 W per unit means derating within a multi-pole assembly is minimal — you can pack several of these side by side without cooking the enclosure. Ambient temperature range is -25 to +45 °C, with derating above 30 °C: 30.08 A at 40 °C, 29.12 A at 45 °C, 27.84 A at 50 °C, 25.92 A at 55 °C. If the panel sits in a hot machine cabinet, size the upstream protection for the derated figure, not the 32 A nameplate.
Lifecycle status is current — no end-of-life notice, no last-time-buy window to track. The 5SU9 design series is the active SENTRON RCBO line, so you can spec it into new BOMs without worrying about a forced redesign next year. Overvoltage category III means it's rated for fixed-installation downstream of the main distribution board, not just outlet-level protection. Halogen-free and silicon-free construction matters for semiconductor fabs, clean rooms, or any environment where outgassing from a fault event could contaminate optics or wafers. Touch protection is built into the terminals — no exposed live parts when wired correctly.
Compared to the standard MCB-only 5SL6563-7BB (a 32 A C-curve without RCD), the 5SU9356-7KP32 adds Type A residual-current protection in the same 2-module footprint. If your panel was laid out around the 5SL6563-7BB, this RCBO drops into the same DIN-rail slot and terminal range — no rewiring needed for the line and load connections, but you gain the ground-fault trip function. The trade-off is the 6 kA breaking capacity per EN 60898 versus the 10 kA of some standalone MCBs; verify the prospective short-circuit current at the point of installation.