SCK measuring module for monitoring photovoltaic systems, four inputs for measuring current to 20 A, one digital input, SCK interface for communication module, operating temperature: -20 C to 70 C, degree of protection: IP20, supply voltage : via SCK-C MODBUS measures (WxHxD) in mm: 22.5x102x128.5 line SCK-4S-MI-20A. Phoenix Contact.