RCBO for final-circuit protection — 6 A B-curve, 1P+N
The 1P+N design switches the phase conductor and monitors the neutral, fitting single-phase sub-distribution boards where space is tight — one modular width unit (18 mm) per pole. The 35 kA rating under 60947-2 gives selectivity headroom upstream of a standard MCB — useful when the RCBO sits close to a transformer or in a main sub-distribution board. Operating frequency is 50 Hz only. Insulation voltage is rated 253 V, surge voltage resistance 4 kV, overvoltage category III, pollution degree 2 — standard for fixed-installation switchgear in a distribution board.
Temperature derating — real-world current capacity
Above that, the RCBO derates linearly: 5.64 A at 40 °C, 5.46 A at 45 °C, 5.28 A at 50 °C, 5.04 A at 55 °C, 4.86 A at 60 °C, 4.62 A at 65 °C, and 4.44 A at 70 °C (–). If the distribution board runs warm — say 50 °C inside a metal enclosure in summer — the usable current drops to 5.28 A. Factor this into the load calculation; a borderline 6 A circuit could nuisance-trip at elevated ambient.
Protection class is IP20 with the distribution board installed and conductors connected — not rated for wet or dusty locations. The energy limitation class is 3, meaning it limits let-through energy to a low level, reducing arc-flash risk downstream.
Supply can enter top or bottom, which simplifies busbar routing in a crowded panel. The test button requires at least 195 V to operate correctly — ensure the phase-to-neutral voltage is above that threshold for periodic testing.