The Schneider Electric A9P42710 is an Acti9 iC40 miniature circuit breaker (MCB) — a 3P+N, 10 A rated device with a B-curve trip characteristic, used for branch-circuit protection in distribution panels.
Breaking capacity is dual-rated: 4.5 kA Icn per EN/IEC 60898-1 (the MCB standard for household and similar installations) and 6 kA Icu per EN/IEC 60947-2 (the industrial standard for switchgear). The 3P+N configuration protects three phases; the neutral pole is switched but not protected (no overcurrent trip on N). Isolation capability is confirmed per EN/IEC 60947-2 — you can use this MCB as a disconnection point for the downstream circuit during maintenance.
Clip-on mounting to a standard 35 mm DIN rail, with tunnel-type terminals accepting 1–16 mm² rigid or 1–10 mm² flexible wire. The neutral position is left, which matches the typical busbar arrangement in Acti9 distribution boards.
