This device is a surge arrester (SPD) of Type 2, specially designed for the protection of photovoltaic systems against the effects of indirect electric discharges and network overvoltages.
Here are its main features and technical specifications:
- Maximum working voltage (Ucpv): 600V DC. It is optimal for strings of panels operating in this voltage range.
- Rated discharge current (In): 20 kA. It represents the amount of current that the device can withstand repeatedly without breaking down.
- Maximum discharge capacity (Imax): 40 kA. This is the extreme current limit it can divert once.
- Protection level (Up): < 2.6 kV. This is the maximum voltage that will "pass" to the inverter at the time of an incident, ensuring the integrity of sensitive equipment.
- Configuration: It is a modular model, allowing the replacement of spent cartridges without disassembling the entire unit from the electrical panel.
- Installation: Mounts on standard 35mm DIN rail.
- Status indicator: Features a viewing window (green for normal operation, red for cartridge defective/requires replacement).
It is a critical safety element mounted between the solar panels and the inverter, preventing the latter from burning out in case of storms or major voltage fluctuations.
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