The Schneider Electric A9KF71225BQ is a 2-pole miniature circuit-breaker from the Acti9 K60 series, rated 25 A with a C-curve trip characteristic. It's a thermal-magnetic MCB built to EN/IEC 60898-1, meaning it's sized for final-circuit protection in distribution boards — lighting, socket outlets, small motor loads, that kind of duty.
The limitation class is 3 per EN/IEC 60898-1, which means it lets through less fault energy than a class 1 or 2 device — helps with downstream coordination and reduces arc-flash stress on the wiring. Rated 25 A continuous, 2 protected poles, so it switches both line conductors in a single-phase or split-phase circuit. The 2 N.m tightening torque on the tunnel terminals (accepts 1 to 25 mm² rigid, 1 to 16 mm² flexible) is standard for this class — don't overtighten; the terminal can deform. Strip length is 14 mm, which is what the tunnel needs for full conductor grip. Not rated for outdoor or wet-environment installation without an enclosure; IP20 means finger-safe terminals but no water ingress protection.
The 36 mm width (4 x 9 mm pitches) is the standard 2-module footprint for a 2P MCB — plan your rail fill accordingly. Height is 81 mm, depth 70 mm; it'll fit most domestic and industrial enclosures without clearance issues. The toggle actuator is manual, no auxiliary contact or shunt trip built in (no local signalling). If you need remote status or tripping, you'll add the appropriate Acti9 accessory alongside it.