What it is and what it does
The Siemens 5SU9336-7CN06 is a 1P+N RCBO — an RCD-operated circuit breaker from the SENTRON family. It combines overcurrent protection (C-curve, 6 A rated at 30 °C) with residual current detection (30 mA, Type A) in a single 2-module-wide unit. That means one device handles both thermal-magnetic trip for overloads and short-circuits, and ground-fault interruption for sinusoidal AC and pulsating DC residual currents. The 6 kA breaking capacity per EN 60898 covers most residential and light commercial panels; the 10 kA rating per IEC 60947-2 gives it headroom for industrial distribution boards where higher fault currents are possible.
Key ratings and what they mean for fit
C-curve characteristic means the magnetic trip fires at 5 to 10 times In (30–60 A for this 6 A unit), suited for mixed resistive and moderate inductive loads like lighting circuits, small motors, and control transformers. The 30 mA residual sensitivity is the standard for personal protection against fatal shock in most IEC-based codes. Type A detection covers both pure AC fault currents and pulsating DC — the kind you get from single-phase rectifiers in electronics or LED drivers. Pollution degree 2 and overvoltage category III are typical for fixed-installation distribution boards. The 4 kV rated surge voltage (impulse withstand) means it survives switching transients and nearby lightning-induced spikes without nuisance tripping or damage.
Where it goes in the panel
Snaps onto DIN rail, 2 module widths. Mounting position is unrestricted. Supply can feed from top or bottom. Depth is 77 mm with 70 mm installation depth. Halogen-free and silicon-free.