The Schneider Electric A9N16260 is an Acti9 xID residual current circuit breaker (RCCB) — a 4-pole, 63 A unit with 300 mA earth-leakage sensitivity, Type AC, rated for 400-415 V AC at 50 Hz.
The 300 mA sensitivity on this RCCB is not for personnel protection — that's the 30 mA job. This is sized for fire prevention and equipment protection on circuits with higher natural leakage, like long cable runs or industrial heaters. Same footprint, different internal sensing.
Mounts on standard DIN rail via the clip-on mechanism. Neutral is on the left (fixed position). Tunnel terminals accept 1-35 mm² rigid or 1-25 mm² flexible cable; strip length is 14 mm, torque to 3.5 N·m. The 72 mm width (8 x 18 mm pitches) is a standard 4P RCCB footprint — it fits any Acti9 board without crowding adjacent ways. Lockable with a padlocking device for lockout/tagout.
Rated breaking and making capacity is 630 A per EN/IEC 61008-1. Insulation voltage is 500 V AC. Pollution degree 2, tropicalisation class 2 per IEC 60068-1 (handles 95% RH at 55 °C). Electrical and mechanical durability are both rated at 4000 cycles. IP20 finger-safe terminals. Ambient storage range is -40 to 85 °C.