What this RCBO is and what it protects
The Siemens SENTRON 5SU1324-6KX16 is a 2-pole RCBO — a combined residual-current device and miniature circuit breaker in one 3-module-width unit. It protects a 16 A single-phase circuit against overload, short-circuit, and earth leakage, with a 30 mA type A residual-current trip that catches pulsating DC faults from electronics or variable-speed drives. Rated 10 kA breaking capacity per EN 60898, and 20 kA per IEC 60947-2 — the higher IEC figure matters when this RCBO sits in an industrial panel where the prospective fault current at the board exceeds 10 kA. The B-curve trips between 3 and 5 times rated current, so it clears fast on a hard short but tolerates the inrush of resistive or modest motor loads without nuisance trips. Rated operating voltage is 110/120 V AC at 50/60 Hz. Verify your line-to-neutral voltage before specifying.
Survives the nacelle — wide temperature and surge resilience
Rated for -40 °C to 75 °C ambient, this RCBO handles the thermal swing inside a turbine nacelle or outdoor enclosure without derating. The 4 kV surge voltage resistance and 1 kA surge current (8/20 µs) mean it takes lightning-induced transients on the line side — no up-tower swaps from a close strike. Halogen-free and silicon-free construction matters if the panel is in a confined space with sensitive electronics — no corrosive off-gassing during a fault arc. Mounting position is any, so it fits vertical or horizontal DIN-rail layouts. Power supply can enter from top or bottom — useful when retrofitting into an existing distribution board where the busbar orientation is fixed.
Panel fit and compliance notes
Occupies 3 modular width units (54 mm wide) on DIN rail, with a 70 mm installation depth plus the 77 mm overall depth for wiring clearance. IP20 rating applies once the distribution board is installed with connected conductors — the front face is finger-safe; the busbar area is not. Overvoltage category III and pollution degree 2 — suitable for fixed installations downstream of the main distribution board, not for outdoor exposed positions. Compliance documentation: the SENTRON series carries CE marking and is designed to EN 60898 and IEC 60947-2. RoHS and REACH declarations are standard with the product from Siemens. No UL listing is cited on this variant — verify for North American installations.