Siemens 5SY4525-7CV MCB, 15kA Icu, 1P+N, C25

The Siemens 5SY4525-7CV is a miniature circuit breaker (MCB) rated for a 15kA breaking capacity (Icu) at 230/400V, in a single-pole-plus-neutral (1P+N) configuration with a C25 tripping curve. The C-curve means it's sized for moderate inrush loads like small motors, pumps, and lighting circuits — the 25 A rating handles the continuous draw, and the 15 kA short-circuit capacity clears faults up to that level without welding contacts or cascading damage to downstream gear.