What it is and what the ratings mean
The Siemens 5SL6525-8CC is a miniature circuit breaker (MCB) from the Basic Devices family, rated 230 V with a 6 kA breaking capacity, 1+N-pole configuration, D-curve trip characteristic, and a 25 A rated current. The D-curve means the magnetic trip operates at 10–20 times In (250–500 A instantaneous), designed for loads with high inrush currents such as motors, transformers, or lighting ballasts — common in industrial control panels where a standard B- or C-curve would nuisance-trip on startup.
Integration and panel fit
Snap-on DIN-rail mount, 1+N-pole width (two modules). The neutral pole switches and protects the neutral conductor — verify your distribution panel has a dedicated neutral busbar for the load side. The 6 kA breaking capacity at 230 V is suited for residential or light commercial sub-distribution; for higher fault-current environments (above 6 kA), coordinate with an upstream limiting device.