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                              • SCHNEIDER A9Z21440 Acti9 iID Residual Current Circuit Breaker

                                The SCHNEIDER A9Z21440 is an Acti9 iID residual current circuit breaker (RCCB), rated 40 A, 4-pole, 30 mA, Type A. It provides residual-current protection against electric shock and is designed for DIN-rail installation in AC distribution systems. Schneider confirms the model as a 4P 40A 30mA Type A RCCB with double terminals.

                                Key Technical Specifications

                                Parameter	Specification
                                Brand	Schneider Electric
                                Model	A9Z21440
                                Product Family	Acti9 iID
                                Product Type	Residual Current Circuit Breaker (RCCB)
                                Poles	4P
                                Rated Current	40 A
                                Residual Current Sensitivity	30 mA
                                RCD Type	Type A
                                Trip Characteristic	Instantaneous
                                Rated Voltage	380–415 VAC
                                Frequency	50/60 Hz
                                Rated Insulation Voltage	500 VAC
                                Impulse Withstand Voltage	6 kV
                                Conditional Short-Circuit Current	10 kA
                                Mounting	35 mm DIN rail
                                Terminals	Double terminals
                                Width	Approx. 72 mm
                                Height	Approx. 91 mm
                                Depth	Approx. 73 mm
                                Standards	IEC/EN 61008-1, IEC/EN 61008-2-1

                                The manufacturer's data specifies 1500 A making/breaking capacity, 10 kA conditional short-circuit current, and 6 kV impulse withstand voltage.

                                Advantages & Features

                                • 40 A / 4-pole configuration
                                • 30 mA Type A residual-current protection
                                • Detects AC and pulsating DC residual currents
                                • Instantaneous earth-leakage protection
                                • Double terminals simplify wiring and maintenance
                                • Front mechanical earth-fault indication
                                • DIN-rail mounting
                                • Compact Acti9 modular design
                                • Suitable for protection against electric shock
                                • Compatible with Acti9 accessories and captive padlocking devices

                                Typical Applications

                                • Industrial electrical distribution
                                • Commercial buildings
                                • Control panels
                                • Factory distribution boards
                                • HVAC systems
                                • Lighting and power circuits
                                • Industrial machinery
                                • Three-phase + neutral AC systems

                                Important Precautions

                                • Confirm the system voltage is within 380–415 VAC.
                                • Verify that 30 mA Type A protection is appropriate for the application.
                                • This is an RCCB, not an MCB; it does not provide ordinary overcurrent/overload protection by itself.
                                • Use appropriate upstream overcurrent/short-circuit protection.
                                • Verify correct neutral and phase wiring before energizing.
                                • Install on a suitable DIN rail and observe the manufacturer's wiring requirements.
                                • Disconnect power before installation or maintenance.

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