The A9P55710 is a 3P+N miniature circuit-breaker from the Acti9 iC40H series, rated 10 A with a C curve — meaning the magnetic trip operates between 5 and 10 times In (50–100 A), which suits mixed resistive and moderate inductive loads like lighting circuits, small motor feeders, and general distribution panels where inrush is not extreme. The 3P+N configuration protects three phases and switches the neutral, so it fits three-phase four-wire distribution boards where you want the neutral isolated on opening.
Clip-on mounting to DIN rail, 6 x 9 mm pitches wide (54 mm), with tunnel terminals accepting 1–16 mm² rigid or 1–10 mm² flexible cable. IP20 on the terminals, IP40 inside the modular enclosure — fine for a clean indoor distribution board, not for a washdown environment. The toggle gives ON/OFF indication plus a separate trip indicator, and there is a padlocking provision for lockout/tagout.