What this RCBO does on the panel
The Siemens 5SU9356-1CR63 is a 1P+N RCD-operated circuit breaker (RCBO) from the SENTRON series, combining overcurrent protection and residual current detection in a single 36 mm wide (2 MW) module. It is rated 63 A at 230/240 V AC, 50/60 Hz, with a 30 mA residual current trip — the standard threshold for personal protection against electric shock in final circuits. The C-curve characteristic (tripping between 5 and 10 times rated current) suits it for circuits with moderate inrush, such as lighting banks, socket outlets, and small motor loads in commercial or residential distribution boards.
Breaking capacity and selectivity
The unit carries a 6 kA breaking capacity per EN 60898 and 10 kA per IEC 60947-2. The higher IEC figure matters when the RCBO sits downstream of a larger upstream breaker in an industrial panel — it confirms the device can interrupt fault currents up to 10 kA without welding its contacts, provided the prospective short-circuit current at its installation point stays under that limit. The 1 kA surge current withstand (8/20 μs waveform) gives it basic immunity to lightning-induced transients on the line side.
Mounting and integration
Snaps onto standard 35 mm DIN rail. The 77 mm depth (70 mm installation depth) fits flush in most distribution boards without protruding beyond the enclosure depth. Supply can enter from top or bottom — no mandatory orientation. Touch protection is built in (fingertip-safe terminals per IP20 when the board is closed with conductors connected). The neutral conductor is switched internally (1P+N), so no separate neutral bar connection is needed downstream of this device.
Environmental and compliance
Rated for ambient temperatures from -40 °C to +75 °C, with up to 95% humidity. Halogen-free and silicon-free construction. Overvoltage category III, pollution degree 2 — suitable for fixed installations downstream of the utility meter. The device is classified as energy limitation class 3, meaning it limits let-through energy in a fault to a level that protects downstream wiring.