The Schneider Electric A9N1P63DIN is a 1-pole miniature circuit breaker from the Acti9 xC60 range, rated at 63 A with a D tripping curve. For a 63 A breaker, that's around 756 A instantaneous trip. Breaking capacity is 6 kA at 220–240 V AC (50/60 Hz) and 15 kA at 12–48 V DC, both per IS/IEC 60947-2.
At 18 mm wide (2 x 9 mm pitches), it occupies one modular space. The bottom terminals are tunnel type with a biconnect feature, letting you daisy-chain outgoing circuits without an extra busbar. Strip length is 13 mm; tighten to 3.5 N·m. IP20 finger-safe protection on the front, so it's suitable for enclosed distribution boards where the operator only touches the toggle. Pollution degree 3 means it handles conductive dust and occasional condensation inside a typical panel.