The Siemens 5SU1323-1WM10 is a 2-pole RCBO (residual-current circuit breaker with overcurrent protection) from the SENTRON 5SU1 series, combining a 10 A C-curve MCB with a 30 mA AC-type RCD in a single 4-module-wide unit. It is designed for final-circuit protection in residential and commercial distribution boards, providing both overcurrent and earth-fault protection in one device.
The 30 mA residual-current trip threshold provides supplementary protection against electric shock; it is the standard level for general-purpose socket circuits in most IEC-based wiring regulations. Breaking capacity is rated 4.5 kA per EN 60898 for domestic-type MCBs and 15 kA per IEC 60947-2 for industrial-type circuit breakers — the higher figure applies when the device is used in an industrial distribution board with higher prospective fault current.
The 70 mm installation depth and 4-module width are typical for a 2-pole RCBO — check the board's gutter space and door clearance before committing. Screw-type terminals accept solid or stranded conductors from 1.5 to 25 mm²; tighten to 2.5–3 N·m. The IP20 rating applies only when the distribution board is installed and conductors are connected — this is a panel-internal device, not for wet or outdoor locations.