The Schneider Electric A9R51440 is an Acti9 iID residual current circuit breaker (RCCB), 4-pole, rated 40 A with 30 mA earth-leakage sensitivity. Rated operational voltage is 400 V AC at 50/60 Hz, with a breaking capacity of Idm 1500 A / Im 1500 A. That's enough for outgoing feeder protection in a distribution board where you need ground-fault isolation on a three-phase circuit.
Clip-on mount to DIN rail, 8 x 9 mm pitch modules wide (72 mm). Depth is 73.5 mm, height 91 mm — standard modular footprint for a 4P RCCB. Neutral on the left, toggle control. Terminals accept up to 35 mm² rigid or 25 mm² flexible, with a stripping length of 14 mm and torque of 3.5 N.m. IP20 on the body, IP40 inside a modular enclosure. That's a panel-friendly profile for a 40 A device.
Built to EN/IEC 61008-1. Pollution degree 3, rated insulation voltage 500 V AC. Electrical durability 15,000 cycles (AC-1), mechanical 20,000 cycles. Voltage-independent residual current tripping — no auxiliary supply needed. Instantaneous tripping, no intentional delay.