Rating and application
The Siemens 5SL4525-8CC is a 1+N-pole miniature circuit breaker rated 230 V with a 10 kA breaking capacity and D characteristic at 25 A. The D curve means it tolerates higher inrush currents — typical for motor, transformer, or lighting ballast loads where the start-up surge would trip a B or C curve prematurely. In a panel, the 1+N configuration switches both line and neutral, with overcurrent protection on the line pole only. It sits in the Siemens Basic Devices family, a standard residential and light-commercial MCB line. The DIN-rail mount clips into any 18 mm-wide slot in a distribution board or sub-panel.