The Siemens 5SU1324-8RC32 is a combined residual current and overcurrent protection device — an RCBO — rated 32 A, 2-pole, in a 4-module wide housing. It carries a D tripping characteristic for high inrush loads and a Type A 30 mA residual current sensitivity for sinusoidal and pulsating DC fault currents.
What the ratings mean for fit
The D characteristic means the magnetic trip threshold is 10–20× In (320–640 A), sized for loads with high starting surges — think motorized conveyor drives, compressors, or pump starts where a B or C curve would nuisance-trip. The 30 mA Type A residual sensitivity catches both smooth AC ground faults and pulsed DC faults from rectified loads (VFDs, switched-mode supplies), which a plain AC type would miss. Two-pole switching isolates both line and neutral on a single-phase or split-phase circuit.
Where it goes in the panel
Four module widths on a DIN rail — standard 18 mm per module, so 72 mm total. Snaps onto the rail in a distribution board or sub-panel. The 32 A rating suits feeder circuits for small motor groups, lighting distribution, or socket-outlet circuits in commercial and light industrial builds.