The 5SY6550-8CC is a Siemens SENTRON miniature circuit breaker rated 50 A with a D tripping characteristic, 1-pole plus switched neutral (1P+N), and a 6 kA breaking capacity per EN 60898 at 230 V AC. The 2 MW width (36 mm) occupies two standard DIN-rail positions, and the neutral pole switches simultaneously with the line pole, so it isolates both conductors on a single-phase circuit — no separate neutral bar needed downstream.
Deployment context
The IP20 rating applies only with connected conductors — the breaker itself is open-frame, intended inside a closed enclosure. Suitability marked for mechanical engineering and industrial environments, which matches the D-curve application: conveyors, pumps, compressors, and machine-tool circuits where the load draws a high starting surge. The 50 A rating at 230 V AC covers a single-phase branch up to roughly 11.5 kW resistive or a motor load sized within the D-curve's inrush envelope.
Compliance and approvals
The breaker carries a 6 kA breaking capacity per EN 60898 and a 5 kA rating per UL 1077 and CSA C22.2 No. 235, so it is accepted in both IEC and North American control-circuit applications (though not as a branch-circuit protective device under UL 489). Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz — enough for machine-mounted panels near moderate vibration sources.