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 1 kA surge current withstand (8/20 μs waveform) gives it basic immunity to lightning-induced transients on the line side.
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.
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.