The Schneider Electric A9DF3716 is an Acti9 iCV40 residual current circuit breaker with overcurrent protection (RCBO) — 3P+N, 16 A rated current, C-curve, 30 mA earth leakage sensitivity. Breaking capacity is 6 kA Icn at 400 V AC, 50/60 Hz, conforming to EN/IEC 61009-2-1.
The 16 A rating and C-curve (5–10× In magnetic trip) suit general-purpose lighting and socket-outlet circuits where inrush from small motors or capacitive loads is moderate — not for heavy motor starts where a D-curve would be needed. The 30 mA earth leakage sensitivity is the standard for personal protection against indirect contact in residential and commercial final circuits per IEC 60364. The limitation class 3 (EN/IEC 61009-2-1) means the let-through energy is low enough to allow downstream selectivity with a higher-rated upstream device — useful in multi-level distribution.
Clip-on DIN rail mount, 90 mm wide × 93 mm high × 73 mm deep — occupies 10 module pitches. Neutral is on the left. Tunnel-type terminals accept 1–16 mm² rigid or 1–10 mm² flexible cable; tightening torque is 2 N·m. IP20 on the body, IP40 inside a modular enclosure. Mechanical and electrical durability both rated at 20,000 cycles.