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Businesses and non-Italian private customers: purchase with 22% VAT. The 10% rate is reserved for private customers resident in Italy — find out more.
Foreign companies entitled to 0% VAT: please write to info@litio.store.
Delivery in 10-20 daysCombiner boxAC sideLitio Store
AC Combiner Box 40 A Three-Phase with Type 2 SPD for Inverter Connection
Alternating current combiner box dedicated to the connection of the inverter to the grid in large three-phase photovoltaic systems. It is installed on the AC side, between the inverter output and the distribution board, and forms the single point where line protection and surge protection are gathered.
It contains a 40 A miniature circuit breaker for overload and short-circuit protection of the three-phase line, with an isolation function, and a DEHN brand Type 2 surge protective device, a German manufacturer specialising in surge and lightning protection. The class II SPD limits transient surges induced by indirect lightning strikes and by grid switching operations. On a 400 V three-phase grid, 40 A corresponds roughly to inverters up to about 27.7 kW.
Key features
DEHN surge arresterThe Type 2 SPD fitted is made by DEHN, a German manufacturer specialising in lightning and surge protection.
Inverter connectionIt creates the protected connection point between the inverter AC output and the distribution board.
40 A circuit breakerIt protects the three-phase line against overloads and short circuits and allows the inverter to be isolated from the grid.
For large systems40 A three-phase: suited to inverters with an indicative power output of up to about 27.7 kW.
Pre-wired boxComponents already fitted and connected: in the field only the input and output connections remain.
Spacious enclosure259 × 319 × 144 mm for 2.2 kg, with a volume suited to wiring conductors of a larger cross-section.
Technical specifications
| Feature | Value |
|---|---|
| Switchboard type | AC combiner box for connecting the inverter to the grid |
| System side | Alternating current (AC), between the inverter and the distribution board |
| Number of poles / phases | Three-phase (3L + N) |
| Nominal current | 40 A |
| Indicative inverter power | Up to approx. 27.7 kW (400 V three-phase, 40 A) |
| Surge protective device (type) | Type 2 SPD (class II), DEHN component |
| Miniature circuit breaker (MCB) | Sì, 40 A |
| Residual current device (RCD) | Not present |
| Dedicated isolator switch | Not present: isolation is provided by the miniature circuit breaker |
| Dimensions | 259 × 319 × 144 mm |
| Weight | 2.2 kg |
| Reference standards of the components | EN 61643-11 (surge protective devices), EN 60898-1 (miniature circuit breakers) |
Installation and wiring must be carried out by qualified personnel in accordance with the applicable standards and the electrical design of the system.