The A9N60721 is a 1-pole Acti9 C120 miniature circuit-breaker rated 100 A at 40 °C with a D tripping curve, meaning its magnetic trip threshold is 12 × In ±20 % — about 1200 A instantaneous — sized for loads with high inrush like motor circuits or transformers where a C curve would nuisance-trip on startup. Breaking capacity is 5 kA Icu at 230…400 V AC 50/60 Hz per EN/IEC 60947-2, which is the standard for distribution boards in commercial and light industrial panels where the prospective fault current stays under that level. The thermal-magnetic trip unit combines a bimetal for overload protection and a solenoid for short-circuit; D curve gives a wider magnetic band than B or C, so it fits motor feeders, welding equipment, or power supplies with large input capacitors.
Tunnel terminals accept 1…50 mm² rigid or 1.5…35 mm² flexible cable; strip length 15 mm, torque to 3.5 N·m. IP20 finger-safe protection on the front, so it's suitable for open-panel installation inside a locked enclosure.