In the construction of photovoltaic systems, international standards and national rules must be kept in mind. The national rules may have significant variations between different nations. However, the contactors in photovoltaic applications are typically installed immediately upstream and downstream of the inverter.
The contactor on the AC side is a common contactor that must be sized in category AC-1 or AC-3 according to the national regulation of the area in which it will be installed. The contactor on the DC side can still be a general purpose contactor if the voltage is under 400V. For sizing refer to the specific tables for DC use of the contactors shown in the Lovato catalogues. For voltages over 400V it is advisable to use contactors specially designed for DC applications.
These contactors have arc chambers equipped with permanent magnets that guarantee fast and effective interruption of the electric arc. Lovato BFD contactors have very high performance and can be used for voltages up to 1000V DC.
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