The Siemens 5SV5314-6KL is a 2-pole SENTRON residual current circuit breaker (RCCB) rated for 40 A at 230 V AC, with a 30 mA trip threshold and Type A fault-current sensitivity. It's an instantaneous-trip device — no intentional delay — so it clears ground faults within one cycle, which is the right call for general-purpose branch circuits where you want fast disconnection on a live-line fault.
The 30 mA trip is the standard threshold for personnel protection — it catches leakage currents that could pass through a human body while avoiding nuisance trips from normal cable capacitance. Type A means it detects both sinusoidal AC residual currents and pulsed DC residual currents, which covers most modern electronics and single-phase rectified loads like switched-mode power supplies and LED drivers.
Panel integration
The 36 mm width occupies 2 width units per DIN 43880, so it fits a standard modular enclosure.