This is an IP66 dc isolator, it provides safe connection to your solar panels. The KG-Series from Kraus & Naimer is available from 220V DC up to 1000V. You can connect in one enclosure two photovoltaic strings. 

Switch - Disconnectors, 4 pole - for 2 string

• IP66/67 Protection
• Black/Grey Padlockable Handle
• Class II compliant, Grey Insulated Enclosure
• Switch Interlocked with a lid to prevent opening in the “ON” position
• Rated for use in ambient temperatures of 50°C

KGD40 only:

• Up to 50 amps @1000 VDC to give a higher rating
• Permanent magnets in the contact body are used to reduce arcing time
• Non-polarity sensitive