The Schneider Electric A9KF21132BQ is a 1-pole miniature circuit-breaker from the Acti9 K60 series, rated 32 A with a B-curve trip characteristic. It protects branch circuits in residential and light commercial distribution boards, tripping magnetically between 3 and 5 times rated current for fast response to short circuits while allowing moderate inrush from resistive loads.
Breaking capacity and standard compliance
Rated breaking capacity is 10 kA Icn at 240 V AC, 50/60 Hz, certified to EN/IEC 60898-1. That 10 kA figure is the maximum prospective fault current the breaker can safely interrupt under standard conditions — sufficient for most final sub-circuits in a TN or TT system where the fault level at the board stays under that threshold. Limitation class 3 per EN/IEC 60898-1 means it limits let-through energy effectively, reducing stress on downstream equipment during a fault.
Mounting and integration
Snaps onto a standard 35 mm DIN rail, occupying 2 x 9 mm pitches (18 mm total width). Tunnel terminals accept 1 to 25 mm² rigid or 1 to 16 mm² flexible copper, with a tightening torque of 2 N.m. Wire strip length is 14 mm for both top and bottom connections. The IP20 finger-safe enclosure suits enclosed distribution boards; not rated for washdown or outdoor exposure.