The Siemens 5SU9346-7CR06 is a combined residual current circuit breaker with overcurrent protection (RCBO) in a single 1P+N module. It integrates a Type A RCD rated at 30 mA with a C-curve MCB rated at 6 A, all with a 6 kA breaking capacity at 230 V AC. This is the unit that fits a single-width DIN-rail slot in a residential or light commercial distribution board — no extra space needed for a separate RCD and MCB.
What the ratings mean for fit
The 30 mA Type A RCD detects sinusoidal AC fault currents plus pulsating DC fault currents up to 6 mA smooth DC — the standard for circuits feeding electronics, appliances with half-wave rectifiers, or variable-speed drives. The C-curve (6 A) trips between 5 and 10 times rated current, so it handles motor inrush and capacitive loads without nuisance tripping. The 6 kA Icn is the short-circuit breaking capacity per EN 60898 — sufficient for most final subcircuits in a TN or TT system where the prospective fault current stays under that threshold.
Deployment context
Snap-on mounting to a 35 mm DIN rail per EN 60715. The 1P+N format occupies one module width (roughly 18 mm), so it fits distribution boards where space is tight. The Type A RCD means it is suitable for circuits with single-phase electronic loads — think washing machines, heat pumps, or EV chargers — where a pure AC RCD would miss pulsating DC fault currents.