The Schneider Electric A9Z03440 is a 4-pole residual current circuit breaker (RCCB) from the Acti9 ID K family, rated 40 A continuous and 300 mA earth-leakage sensitivity. Rated operational voltage is 380...415 V AC 50 Hz. Voltage-independent tripping technology detects earth faults even if line voltage collapses. Clip-on mounting to a standard 35 mm DIN rail, 72 mm wide (8 x 9 mm pitches), with terminals accepting up to 35 mm² rigid or 25 mm² flexible conductors. The IP20 body is rated for enclosed distribution boards; IP40 applies when fitted in a modular enclosure. For panel builders: strip 14 mm, torque to 3.5 N·m top or bottom.
Carries VDE quality label. Pollution degree 2 (normal, non-conductive pollution only). Impulse withstand voltage 4 kV, impulse current withstand 200 A (8/20 µs waveform).