The Siemens 5SU9356-1CN10 is a 1P+N residual-current-operated circuit breaker (RCBO) from the SENTRON family, combining overcurrent and earth-fault protection in a single 2-module-wide unit. It is rated 10 A with a 30 mA residual-current trip, Type AC (sensitive to sinusoidal AC fault currents), and a C tripping characteristic — meaning it tolerates short inrush peaks typical of motor or capacitive loads before the thermal-magnetic mechanism clears a sustained overload or short circuit. The operating voltage is 230/240 V AC, 50/60 Hz, with an insulation voltage (Ui) of 264 V and a rated surge voltage resistance of 4 000 V — overvoltage category III, pollution degree 2, which covers fixed-installation distribution boards in buildings and light industrial environments.
Mounting and integration into a panel
Depth is 77 mm, installation depth 70 mm, height 90 mm. The supply cord can enter from either top or bottom, which simplifies busbar routing in a crowded enclosure.
The 30 mA residual sensitivity (Type AC) is the standard for general-purpose socket-outlet protection in residential and commercial final circuits per IEC 60364. It detects sinusoidal AC earth faults only — not pulsating DC or smooth DC faults. If the downstream load includes rectifiers, variable-speed drives, or LED drivers that can generate DC fault components, a Type A or Type F RCBO would be needed instead. The C characteristic (10× to 15× In magnetic trip) means it will not nuisance-trip on the inrush of a small motor or a bank of capacitors, but it will still clear a hard short within the 6 kA rating.