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AC Combiner Box 20 A Three-Phase with Type 2 SPD
AC Combiner Box 20 A Three-Phase with Type 2 SPD
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€128.33
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€128.33
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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.
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AC Combiner Box 20 A Three-Phase with Type 2 SPD
Combiner box in alternating current for three-phase photovoltaic systems, to be installed on the AC side between the inverter output and the electrical distribution board. It gathers into a single enclosure the protection devices required on the grid connection line, simplifying field wiring and making the system tidier and easier to inspect.
The box contains a 20 A miniature circuit breaker for overload and short-circuit protection of the three-phase line and for isolating the inverter, and a Type 2 surge protective device (class II) that diverts to earth transient surges of indirect atmospheric and switching origin. On a 400 V three-phase grid, 20 A corresponds roughly to inverters up to about 13.8 kW.
Key features
Suitable for three-phase invertersConfiguration for a 3L + N grid: it protects the entire three-phase line leaving the inverter.
20 A circuit breakerIt protects the cable running to the main board against overloads and short circuits and allows the inverter to be isolated.
Type 2 surge arresterIt limits transient surges coming from the grid and caused by indirect lightning strikes, protecting the inverter electronics.
Power rating20 A on a 400 V three-phase grid: suited to inverters with an indicative power output of up to about 13.8 kW.
Pre-wired boxComponents already fitted and connected: on site only the incoming and outgoing cables need to be terminated.
Compact enclosureDimensions of 319 × 259 × 144 mm for 1.6 kg, suitable for wall mounting close to the inverter.
Technical specifications
| Feature | Value |
|---|---|
| Switchboard type | AC combiner box for photovoltaic systems |
| System side | Alternating current (AC), between the inverter and the distribution board |
| Number of poles / phases | Three-phase (3L + N) |
| Nominal current | 20 A |
| Indicative inverter power | Up to approx. 13.8 kW (400 V three-phase, 20 A) |
| Surge protective device (type) | Type 2 SPD (class II) |
| Miniature circuit breaker (MCB) | Sì, 20 A |
| Residual current device (RCD) | Not present |
| Dedicated isolator switch | Not present: isolation is provided by the miniature circuit breaker |
| Dimensions | 319 × 259 × 144 mm |
| Weight | 1.6 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.