Buy Solar Panel Disconnect Circuit Breaker Isolator to safely isolate your solar panels from the rest of the system. 

Waterproof to IP66 standards, this unit will cover solar panels with system currents from 16a upto 60A.  The circuit breakers are mounted on standard DIN rail, and come with waterproofing cable glands for standard 4mm solar cabling. Voltages from PV Disconnect Box: 12-500V DC.