Rated current and breaking capacity
The Siemens 5SY4213-5 is a 2-pole miniature circuit breaker rated 13 A at AC, with a breaking capacity of 10 kA per EN 60898 and 20 kA per IEC 60947-2. The Class A tripping characteristic means it trips on short-circuit before the let-through energy reaches downstream equipment — suited for protecting semiconductor loads or sensitive control circuits where a standard B or C curve would pass too much energy.
Temperature derating and ambient limits
The 13 A rating holds at 35 °C ambient. At 40 °C the continuous current derates to 12.38 A, at 50 °C to 11.73 A, and at 60 °C to 11.02 A. The breaker operates from -40 °C to 75 °C ambient, with humidity limits of 95 % up to 55 °C, 55 % up to 70 °C, and 35 % at 75 °C. In a sealed panel with no forced airflow, budget the derated figure for the expected internal temperature.
DIN-rail integration and physical fit
The 5SY4213-5 occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. The quick-assembly fastening system snaps onto the rail without tools. Mounting position is any orientation. The combined terminal design accepts top and bottom wiring — no need to flip the breaker for feed direction.