50 A B-curve MCB for panel protection
The Siemens 5SY7150-6 is a SENTRON miniature circuit breaker rated 50 A with a B-curve tripping characteristic, meaning it trips between 3 and 5 times rated current — suited for resistive and general-purpose loads where short inrush isn't expected. Single-pole design (1P) fits one modular width (18 mm) on the DIN rail. Breaking capacity is 15 kA per EN 60898 and 20 kA per IEC 60947-2, so it handles substantial fault currents in industrial panelboards without cascading upstream.
Temperature derating and installation
Rated 50 A at 35 °C ambient; derates to 46.35 A at 45 °C, 45.1 A at 50 °C, 43.75 A at 55 °C, and 42.4 A at 60 °C. Mount in any position — the quick-assembly system snaps onto the DIN rail, 70 mm installation depth. IP20 with connected conductors, pollution degree 3, overvoltage category III. Operating range -40 to 75 °C, humidity limits per the spec (95% to 55 °C, derating above). Sealable, halogen-free, silicon-free — relevant for clean-room or coated-panel environments.