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Centralized system

A centralized system means that a large number of strings is connected to one central inverter. In this application we have to consider extensive wiring on the DC side, which makes it necessary to install SPD type T1, or in the best case to choose a combined SPD type T1+T2 on both A and D positions. A suitable SPD representative can be HLSA12,5 PV 1 500. This product is determined specifically for UCPV = 1 500 V DC, but we also offer variants for 1 000 V DC. It is in Y connection, which is resistant to earth fault of live conductors and has zero residual (leakage) current. If you insist on a cheaper variant, we also offer variants in the same voltage range in U connection with a marking /2 at the end of the product name. The HLSA12,5 PV product series for LPL levels I and II is not equipped with an internal DC arc fault disconnector, and therefore back-up fuse is required. If remote monitoring of the surge protection status is required, the variants marked S can be used, i.e. for example HLSA12,5 PV 1 500 S. The potential-free contact of this remote monitoring is then connected to the building‘s control system (typically as an input of a PLC control system), where it permanently informs the investor about the status of the surge protection device, without the need for physical control of the switchboard.


On the other hand, on the AC side, it is sufficient to install only one SPD type T1, or in the best case to select a combined SPD type T1+T2+T3, at position C, as the distance between the inverter and the main switchboard is not expected to be longer than 10 m. In this switchboard, it is common to find a TN-C system configuration with a voltage size of 3 x 230 V / 50 Hz. HLSA25G-255/3+0 S in the remote monitoring version corresponds to these conditions. If the entire electrical distribution of the building is of TN-S type, the HLSA25G-255/4+0 S configuration can be used. There are also cases where there is an isolated power supply system on the AC side. For this case it is important to select an SPD from a series directly designed for the IT power supply system, e.g. HLSA12,5-440/3+1 S IT.

image/svg+xml Grid SPD DC SPD DC Main earthing bar Subsidiary earthing bar SPD AC > 10 m PV array PV inventer Main distribution board Subsidiary earthing bar A SPD FOR DC (INVERTER) C SPD FOR DC B SPD FOR AC

Our solutions

  1. SPD FOR DC (INVERTER)
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  2. SPD FOR AC
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  3. SPD FOR DC
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    By ticking this box you will give us the information that you are not sure about the correctness of your selection. However, it is necessary to send an inquiry.