Rating and application context
The Siemens 5SU9326-7CN16 is a single-module RCBO combining overcurrent protection and residual current detection in one DIN-rail device. Its 6 kA breaking capacity (Icn) at 230 V AC is sized for final subcircuits in residential and light commercial distribution boards where the prospective fault current stays under that threshold. The Type A residual-current element detects AC pulsating and smooth DC fault currents up to 30 mA — the standard threshold for personal protection against indirect contact (IEC 60364-4-41). C-characteristic (C-Char) means the magnetic trip operates at 5 to 10 times In (80 to 160 A for this 16 A unit), suited for loads with moderate inrush such as lighting banks, small motor circuits, and socket outlets.