Compact AC/DC Protection Box for 12.5kW Three-Phase Inverter with DC Surge Arrester -

The compact AC/DC protection box, reference SW1092, is a complete solution designed to secure a three-phase photovoltaic installation up to approximately 12.5 kW. It is intended for installers and integrators working on high-end residential projects or small commercial buildings using a three-phase inverter and requiring a reliable AC and DC protection solution including a DC surge protector. This AC/DC box for three-phase systems combines the AC (3x230/400V grid) and DC (photovoltaic panels) components in a compact, ready-to-install enclosure. The AC section typically includes a three-phase circuit breaker rated for ~12.5 kW, a suitable residual current device (often 300 mA or compliant with photovoltaic standards), and a Type II AC surge protector to protect the system against grid overvoltages. On the DC side, this enclosure includes a DC disconnect switch, DC fuses or circuit breakers depending on the panel-inverter configuration, and a DC surge protector specifically sized for the string voltage (e.g., 600V to 1000V DC). The equipment is mounted in an IP65 IK08 enclosure, conforming to photovoltaic enclosure standards. Although the SW1092 reference is not publicly documented in the sources consulted, market practice for similar 9kWp AC/DC three-phase enclosures with surge protectors shows a comparable configuration. Finally, the enclosure is designed to facilitate inverter connection and grid output, and features markings compliant with the UTE C15-712-1 standard for photovoltaic installations. With this SW1092 enclosure, the installer benefits from a pre-equipped, ready-to-install solution, reducing on-site time and wiring errors. Dual AC/DC protection ensures complete coverage of the photovoltaic system: the AC protection safeguards the inverter and grid connection, while the DC protection safeguards the modules, inverter, and sensitive components against overvoltages or panel-side faults. The integrated DC surge protector is particularly useful for anticipating lightning strikes or transient overvoltages, thus protecting the investment and reducing future maintenance. Compared to a standard, non-specialized enclosure or one without DC surge protection, this model offers clear added value: direct compatibility with a ~12.5kW three-phase inverter, optimized sizing, enhanced compliance, and simplified installation. This protection enclosure is ideal for a three-phase photovoltaic system in residential or small commercial buildings—for example, a house or building with a ~12.5kW (3-phase) three-phase inverter connected to a 400V grid. It can be mounted near the inverter or in the technical room and centralizes AC and DC protection in a single wall-mounted enclosure. It is equally suitable for a self-consumption system or for an installation injecting power into the grid, as the size and configuration are adapted to this power range. Compared to control boxes designed for lower power levels (e.g., 6-10kW) or for single-phase installations, this model is specifically optimized for the three-phase range of ~12.5kW, allowing for a better match between equipment and project requirements without unnecessary oversizing.