SCK measuring module for monitoring photovoltaic 8 inputs for measuring current to 20 A, one digital input interface to SCK communication module interface for voltage measurement module operating temperature: -20 C to 70 C degree protection: IP20 voltage: via SCK-C MODBUS measures (WxHxD) in mm: 22.5x102x128.5 line SCK-MI-20A-8S. Phoenix Contact.