What this RCBO covers
The Siemens 5SU9306-1DV20 is a combined residual current device and miniature circuit breaker (RCBO) in a single 1+N-pole module. It provides both overcurrent protection (C-curve, 20 A rated current) and residual current protection (Type AC, 30 mA sensitivity) in one DIN-rail unit, saving a module width compared to separate MCB+RCCD. The 6 kA breaking capacity (IEC 60898-1) suits it for final subcircuits in residential and light commercial distribution boards where the prospective short-circuit current stays under that threshold. The Type AC detection handles sinusoidal AC residual currents — the standard choice for general socket-outlet and lighting circuits without electronic loads.
Lifecycle and sourcing posture
For a project buyer planning a panel build, this part can be specified into the BOM with confidence that supply will be consistent through the commissioning window. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.
Panel integration notes
Snap-on mounting to 35 mm DIN rail per EN 60715. The 70 mm depth (D=70mm) is standard for Siemens 5SU9 RCBOs — verify enclosure depth clearance if retrofitting into a shallow consumer unit originally designed for 60 mm deep devices. The 1+N-pole configuration switches the line conductor and disconnects the neutral; the neutral pole is not switched but is opened by the residual current mechanism. Wire the supply neutral to the N terminal on the device, not the busbar, for the RCD function to operate.