The SIEMENS 5SY4104-8 is a miniature circuit breaker designed for 230/400 V systems to protect single-pole circuits up to 4 A. Built for electrical distribution panels, it trips on D-characteristic curves suitable for circuits with moderate inrush currents, providing reliable short-circuit and overload protection with a 10 kA breaking capacity. Its compact D = 70 mm form factor saves panel space and simplifies installation in tight enclosures. Use this breaker where controlled tolerance for startup currents is needed—motor feeds, lighting runs, or distribution branches—ensuring circuit integrity and safer maintenance.
