The Siemens SENTRON 5SQ2560-0KA25 is a 2-pole miniature circuit breaker configured as 1P+N — it switches the live conductor and switches the neutral, with overcurrent protection on the phase only. The 3 kA breaking capacity per EN 60898 at 240 V AC covers standard domestic supply fault levels; for higher prospective short-circuit currents you'd step up to a higher-rated SENTRON variant.
B-curve trip: magnetic release between 3 and 5 times rated current (75–125 A for this 25 A unit). That suits cable protection and general-purpose loads with no heavy motor start — lighting, socket outlets, control transformers. The 1P+N pole count means it occupies 2 width units (36 mm on a standard DIN rail) and includes a switched neutral, which is required in some regional wiring regulations for single-phase final circuits. Overvoltage category 3 and energy limiting class 3 confirm it's designed for fixed-installation downstream of the utility meter, not for equipment-level protection.
Panel integration
Installation depth is 55 mm, which fits standard distribution board enclosures. Neutral conductor switching is built in, so no external neutral link is needed downstream of the breaker.