The Siemens SENTRON 5SY3025-6KV is a miniature circuit breaker with a B-curve trip characteristic, rated 25 A at 230 V AC, and a 1P+N pole configuration — meaning it switches both line and neutral, with overcurrent protection on the line pole only. It breaks faults up to 4.5 kA per EN 60898, which covers standard residential and light commercial branch circuits where the prospective short-circuit current stays under that threshold.
The B-curve trips between 3 and 5 times rated current (75–125 A for this 25 A unit), so it's sized for resistive and general-purpose loads where inrush is modest — lighting circuits, socket outlets, small heaters. The 4.5 kA breaking capacity per EN 60898 is the standard for domestic distribution boards; if your panel's fault level exceeds that, you'd need a higher-rated MCB or a current-limiting upstream device. The 1P+N design includes a switched neutral, which is common in single-phase final sub-circuits where isolating both poles during maintenance is required. The 70 mm depth matches the standard SENTRON 5SY series footprint, so it aligns with existing busbar and wiring layouts in Siemens distribution boards.