The Schneider Electric EZ9R34240 is a Type AC residual current circuit breaker (RCCB) from the Easy9 range, rated 40 A at 230 V AC 50 Hz with 30 mA earth-leakage sensitivity. Two-pole, clip-on DIN-rail mount, IP20 — sized for residential and small commercial outgoing circuits where instantaneous earth-fault protection is required.
40 A rated current and 500 A breaking capacity cover most final sub-circuits in a domestic or light commercial board — lighting, socket outlets, small appliances. Type AC detection (sinusoidal AC residual currents only) suits general-purpose loads without electronic rectification. Instantaneous tripping means no time delay, so it coordinates downstream of a time-delay S-type RCCB or RCBO if selectivity is needed. Rated insulation voltage 440 V AC and operational voltage 230 V AC 50 Hz match single-phase supply in IEC markets. Pollution degree 2 (non-conductive pollution, occasional condensation) is the typical indoor panel condition. The 18 mm phase-to-phase pitch and tunnel terminals accepting up to 25 mm² rigid cable simplify wiring in a crowded enclosure.
Clip-on to DIN rail, 36 mm wide (2 module widths at 18 mm pitch). Neutral on the left. Toggle control with contact position indicator. Tightening torque 2.5 N·m top or bottom. IP20 — install inside a panel or distribution board with a cover.
Current-production status per manufacturer.