The Siemens 5SV4344-0GV01 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON family, rated 40 A at 50 Hz with a 30 mA trip threshold for AC residual currents. It is an instantaneous (short-time-delayed) type, meaning it trips without intentional delay on fault currents above 30 mA AC — the standard choice for general-purpose shock protection in residential and commercial distribution boards.
Above that temperature the current must be derated: 38.1 A at 45 °C, 35.59 A at 50 °C, down to 17.6 A at 70 °C. For mixed loads with electronics, a Type A or Type F RCCB would be needed. Short-circuit withstand is 10 kA per IEC 61008-1 and 0.8 kA per EN 60898. The 10 kA figure governs the upstream breaker coordination: the RCCB must be backed by an MCB or fuse with breaking capacity at least 10 kA at the fault level. The 0.8 kA EN 60898 rating is a conditional short-circuit rating for the RCCB when protected by a specific upstream device — not a standalone rating. Install in a distribution board with at least IP54 enclosure for damp environments.