The Schneider Electric A9F68403 is a 4-pole miniature circuit breaker from the Acti9 iT60 series, rated 3 A with a C-curve trip characteristic. Breaking capacity is the headline: 50 kA Icu at 415 V AC per EN/IEC 60947-2, and 10 kA Icn at 400 V per EN/IEC 60898-1. The dual standard (60947-2 for industrial, 60898-1 for residential/commercial) gives flexibility: it qualifies for distribution boards under 60898-1 and for industrial switchgear under 60947-2. Limitation class 3 (per 60898-1) means it limits let-through energy enough to protect downstream equipment in most fault scenarios.
Deployment context
Mounts on DIN rail (EN rail) — standard for panel builders. Width is 72 mm, which is 8 x 9 mm pitches (the standard MCB module width). The removable comb busbar is pre-installed, so daisy-chaining phases across multiple breakers in a distribution board is straightforward. Terminals accept 1–25 mm² rigid or 1–16 mm² flexible, with a tightening torque of 2 N·m.