The Schneider Electric A9TYBE240 is an Acti9 Active VigiARC iC60 add-on block that combines arc-fault detection with 30 mA residual current protection in a 2-pole, 40 A rated package, operating at 230 V AC / 50 Hz.
The 40 A rated current and 30 mA earth-leakage sensitivity are the two numbers that decide the BOM line: this block protects a final subcircuit (lighting, socket outlets, small loads) at 40 A, with Type A-SI (super-immunised) leakage detection that rejects nuisance trips from pulsed DC or high-frequency components — common on inverter-fed or LED circuits. Arc-fault detection per EN/IEC 62606 means the block distinguishes a dangerous series or parallel arc (loose connection, damaged cable) from normal switching transients and trips within the standard's time-current curve — critical for fire prevention in final circuits where conventional MCBs and RCDs alone cannot detect arcing. The 275 V ±5 V overvoltage trip threshold (phase-to-earth) protects against neutral loss or supply swells that could damage connected equipment, while the 250 V insulation rating and pollution degree 2 suit standard indoor panel environments.
Clip-on DIN-rail mount, 2-pole width (54 mm), neutral left. Tunnel terminals accept 1–10 mm² flexible or 1–16 mm² rigid; strip 14 mm, torque to 2 N·m. IP20 — panel interior only, no washdown. Electrical durability: 10,000 cycles above 25 A, 20,000 cycles at or below 25 A; mechanical durability 20,000 cycles. Tropicalisation Severity B per IEC 60068-2-30 for 28 days — rated for warm, humid environments without condensation inside the enclosure.