Siemens SENTRON 5SU9326-1CN63 — RCBO, 63 A, 30 mA, C-Curve
It carries a 63 A rated current at AC with a C tripping characteristic, a 30 mA residual current sensitivity, and a 6 kA breaking capacity per EN 60898 and IEC 60947-2. The 30 mA sensitivity means it protects against fatal electric shock from direct contact — the standard threshold for socket-outlet circuits in residential and commercial installations. The C-curve (5–10× In) handles inrush from motor loads, fluorescent lighting banks, and small transformers without nuisance tripping, while the 6 kA short-circuit capacity clears faults up to that level in a 230/400 V distribution board.
Thermal Derating and Installation Constraints
At 40 °C the continuous current must be derated to 58.6 A; at 45 °C to 56.1 A; at 50 °C to 54.8 A; and at 55 °C to 53.6 A. This derating curve governs the real load an RCBO can carry in a closed distribution board — an unventilated enclosure at 45 °C knocks nearly 7 A off the headline figure. Depth is 77 mm, installation depth 70 mm.
Regulatory and Compliance Profile
Overvoltage category III (distribution level), pollution degree 2. The insulation voltage is rated 264 V. It is halogen-free and silicon-free. Touch protection is provided. Energy limitation class 3. The residual current type is AC (sinusoidal AC fault currents only). The product designation per IEC 81346-2 and DIN EN 61346-2 is F (protective device).