What this RCCB is and where it lands
The Siemens 5SV5614-0 is a 2-pole residual current operated circuit breaker (RCCB) from the SENTRON family, rated 40 A with a 300 mA trip sensitivity, Type AC, for 230 V AC single-phase networks at 50 Hz. It occupies 2 modular width units (36 mm) on a DIN rail and is designed for instantaneous tripping — no intentional short-time delay, so it clears ground faults as soon as the residual current exceeds the threshold. The 6 kA short-circuit current rating (SCCR) means it can safely interrupt fault currents up to that level without upstream damage, and the overvoltage category III rating suits fixed-installation distribution boards where the part is permanently connected to the mains supply.
Key ratings and what they mean for fit
The 300 mA sensitivity is a deliberate choice: it is not a 30 mA personal-protection device. At 300 mA this RCCB is sized for equipment protection or fire-prevention circuits where the leakage path is expected to be higher — think industrial ovens, pumps, or lighting circuits where nuisance tripping on a 30 mA unit would be unacceptable. The Type AC designation means it detects sinusoidal alternating residual currents only; pulsating DC or smooth DC faults (common from variable-speed drives or switched-mode supplies) will not reliably trip this device. If the downstream load includes rectifiers or inverters, a Type A or Type B RCCB would be the correct selection. The 40 A rated current at 230 V AC is the continuous load it can carry in a 45 °C ambient without derating. The thermal dissipation per pole is 1.6 W, so in a multi-device enclosure the cumulative heat load needs to stay within the cabinet's thermal budget. The 6 kA SCCR (per IEC 61008-1) governs the maximum prospective fault current at its installation point — coordinate with the upstream overcurrent device to ensure the available fault current does not exceed that value.
Mounting and panel integration
Snaps onto a 35 mm DIN rail (REG profile) and fits any mounting position. The 70 mm installation depth matches standard SENTRON modular devices, so it aligns flush in a multi-row distribution board. Supply can enter from top or bottom — no mandatory orientation. The IP20 rating applies only when the distribution board cover is fitted and conductors are connected; the device itself is not sealed against dust or moisture ingress. Silicon-free construction is a plus for environments where silicone outgassing can contaminate sensitive contacts or optical surfaces — relevant in semiconductor fab sub-fabs or coating lines.