What it is and what the ratings mean
The Schneider Electric A9N17516 is a Clario iDPN N miniature circuit-breaker rated 6 A, 1P+N, with a B tripping curve. The thermal-magnetic trip unit trips magnetically at 3 to 5 times rated current. Breaking capacity is 6000 A Icn at 230 V AC, 50/60 Hz, certified to EN/IEC 60898-1. That 6 kA figure is the maximum fault current the breaker can safely interrupt without welding contacts or causing arc flash — adequate for most residential and light commercial distribution boards, but verify the prospective short-circuit current at the installation point before specifying.
Where it fits in the panel
Clip-on mounting to DIN rail, 18 mm wide per pole, so the 1P+N unit occupies two 18 mm pitches. Depth is 78 mm, height 81 mm. Neutral is on the left.