The Siemens 5SJ6125-7FC is a 1-pole miniature circuit breaker rated 25 A with a C-trip curve and 6 kA breaking capacity. It snaps onto a standard DIN rail inside a distribution board or control panel, protecting a single branch circuit against overload and short-circuit faults.
The C-curve characteristic trips between 5 and 10 times rated current, making it suitable for moderate inrush loads such as small motors, transformers, and lighting banks. The 6 kA breaking capacity at 230/400 V AC covers most residential and light commercial fault levels. Single-pole configuration protects one phase or one line conductor.