The Siemens 5SU9306-0DV40 is a Type AC residual current protective device (RCCB) with a rated sensitivity of 30mA and a breaking capacity of 6kA. It is configured as a 1+N-pole unit with a B-curve overcurrent characteristic rated at 40A, designed for 1MW systems. This is a current-production part, actively available through supply channels.
The B-curve (3-5 In) trips instantaneously on moderate overloads, making it a good match for resistive and general-purpose loads like lighting, socket outlets, and small appliances — not for motor starting or transformer inrush, which would nuisance-trip on a B-curve.
Deployment context
The 1+N-pole format (switched phase plus switched neutral) is common in single-phase final circuits where the neutral is also disconnected for isolation. The Type AC designation means it detects sinusoidal AC residual currents only — not pulsed DC or smooth DC, so it is unsuitable for circuits with variable-speed drives, LED drivers, or EV chargers that generate pulsating DC leakage.