The surge protection device type SG2… with plug-in cartridge for photovoltaic applications is suitable for installation on the direct-current end of a photovoltaic installation and protects against induced overvoltage conditions.
The protection cartridges are plug-in and can be easily replaced for quick servicing.

Operational characteristics

EN maximum continuous voltage Ucpv: 600 V DC, 1100 V DC, 1500 V DC;
Versions with or without relay output having changeover contact for remote status indication;
EN degree of protection: IP20.

From <https://www.lovatoelectric.com/cn_zh/surge-protection-devices-for-photovoltaic-applications/>

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