The Schneider Electric A9F05401 is an Acti9 iC60N miniature circuit breaker rated 1 A with a D curve, 4 poles, and a breaking capacity of 50 kA Icu at 400 V AC. The 4-pole version switches all phases plus neutral, giving full isolation capability (confirmed per both standards).
This breaker delivers 50 kA Icu at 380–415 V AC and 25 kA at 440 V AC per IEC 60947-2, plus 10 kA Icn at 400 V per IEC 60898-1. For a 1 A MCB, that's a lot of interrupting capacity; it means you can use it in high-fault-current locations (like near a transformer) without needing a current-limiting fuse ahead. The limitation class 3 rating (per EN/IEC 60898-1) means it limits let-through energy well, which helps downstream components survive a fault.
At 72 mm wide (8 x 9 mm pitches), it takes up 4 module spaces in the panel — standard for a 4P MCB. IP20 rated, so it's for enclosed panels only — no washdown exposure. The toggle control and trip indicator give local status; the contact position indicator confirms isolation visually.