The Siemens 5SV9316-7NK32 is a SENTRON RCBO — an RCD-operated circuit breaker that combines overcurrent and residual current protection in a single 18 mm wide module. It's rated 32 A at 30 °C with a 30 mA trip threshold, Type A sensitivity for pulsating DC faults, and a C-curve for moderate inrush loads like motor starters or small transformers. The 6 kA breaking capacity per EN 60898 and IEC 60947-2 covers most final subcircuits in commercial and light industrial panels.
What the ratings mean for fit
The 32 A rating is at 30 °C ambient; at 40 °C it derates to 30.4 A, and at 50 °C to 28.8 A. If your panel runs warm — say, a packed enclosure near a machine — use the 40 °C figure for your load calculation. The 30 mA residual current is standard for personnel protection (shock risk) in most IEC-based installations. Type A means it catches sinusoidal AC faults and pulsating DC faults up to 6 mA smooth DC superimposed — needed on circuits with single-phase rectifiers, VFDs, or switching power supplies. The C-curve (5–10× In magnetic trip) avoids nuisance trips on capacitor inrush or motor start, but won't coordinate with a B-curve upstream for full selectivity.
Panel integration
The 5SV9316-7NK32 snaps onto a DIN rail in any orientation — mounting position is unrestricted. At 18 mm (1 MW) wide, it fits a standard modular enclosure slot. Depth is 77 mm, installation depth 70 mm, so it clears a 90 mm deep enclosure with a few mm to spare. Supply can enter from top or bottom, which simplifies busbar routing in a crowded panel. IP20 rating applies once the distribution board is installed with conductors connected — treat it as protected inside the enclosure, not for wet locations.