The Siemens 5SU1356-1DV16 is a combined residual-current circuit breaker with overcurrent protection (RCBO). It has a Type AC residual-current device rated at 30 mA trip sensitivity and a 6 kA short-circuit breaking capacity in a 1+N-pole module with a C-curve 16 A thermal-magnetic trip. The pig-tail neutral connection is for single-phase line and neutral supply.
What the ratings mean for fit
The 30 mA IΔn (rated residual operating current) is the standard for personal protection against direct contact in final circuits — it trips when leakage to earth exceeds that threshold. Type AC detection covers sinusoidal AC residual currents only; if the installation has pulsed DC or smooth DC loads (variable-speed drives, LED drivers, EV chargers), you'd need Type A or F instead. The 6 kA breaking capacity (Icn) is adequate for most residential and light commercial sub-distribution boards where the prospective short-circuit current stays under that level. The C-curve (16 A rated current) means the magnetic trip fires at 5 to 10 times In — suited for inductive loads like small motors or fluorescent lighting banks that draw a higher inrush.
Deployment context
This RCBO snaps onto a DIN rail in a consumer unit or sub-distribution panel. The 70 mm depth (D=70mm) is the standard for Siemens 5SU series — it fits alongside other modular devices without protruding past the enclosure cover. The pig-tail neutral is factory-fitted; the installer connects it to the neutral busbar, while the line side clips into the busbar via the integrated pin or screw terminal.