The Schneider Electric A9KF71402BQ is a 4-pole miniature circuit breaker from the Acti9 K60 series, rated 2 A with a C-curve trip characteristic (magnetic trip between 5 and 10 times In). The thermal-magnetic trip unit handles overloads (thermal bimetal) and short circuits (magnetic coil) in one compact package.
Snaps onto a standard DIN rail (35 mm) — the 9 mm pitch count of 8 gives a 72 mm width, so a 4P breaker occupies four modular spaces. Fixed mounting, toggle control, IP20 finger-safe terminals. The tunnel-type terminals accept 1 to 25 mm² rigid or 1 to 16 mm² flexible copper, with a 14 mm strip length and 2 Nm tightening torque. This is a panel-mount part for distribution boards; the set-of-3 packaging means you get three identical units per order code.
Rated for pollution degree 2 (normal factory/office environment), overvoltage category II, and tropicalisation class 2 per IEC 60068-1 (handles 95% RH at 55 °C).