The Siemens 5SY4550-6 is a SENTRON 5SY4 miniature circuit breaker rated 50 A at 230 V AC, 2-pole in a 1P+N configuration. B-curve tripping characteristic means it clears overloads at 3 to 5 times rated current — standard for general-purpose lighting and receptacle circuits where inrush is moderate. Breaking capacity is 10 kA per EN 60898 and 15 kA per IEC 60947-2, so it coordinates with downstream equipment in most commercial and light industrial panels. UL 1077 / CSA recognized at 5 kA for North American supplementary protection applications.
Panel fit and mounting
Width is 36 mm (2 modular units), depth 76 mm, installation depth 70 mm. Mounts on DIN rail via the quick-assembly system; any mounting position allowed. IP20 with conductors connected — standard for enclosed distribution boards. Combined top and bottom terminals simplify busbar and cable routing. Touch protection is integrated.
Environmental and compliance
Rated for ambient temperatures from -40 °C to 75 °C, with humidity derating above 55 °C. Halogen-free and silicon-free construction. Pollution degree 3, overvoltage category III. Energy limiting class 3. The lifecycle stage is current — this is an active catalog item, not a phase-out. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.