The second disconnect is the ac disconnect.
Solar panel dc disconnect switch.
Disconnect switches are required to comply with electrical codes and pass inspection.
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New installations of solar photovoltaic systems have increased the need for disconnect switches and over current protective devices capable of interrupting currents at voltages up to 1000 vdc.
Solar safety disconnect switch nonfusible heavy duty 30 amps voltage 600vac dc negative ground polarity 3 phase 1 nema enclosure type 20 ip rating indoor material of construction aluminum alloy contact form 3pst number of wires 3 number of poles 3 height 11 10 in width 6 60 in depth 5 10 in standards ul listed file e335018 ul1741.
A solar pv system typically has two safety disconnects.
The pv disconnect allows the dc current between the modules source to be interrupted before reaching the inverter.
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Some us locations require a disconnect switch.