Residual-current device Schneider Electric IDK-AC40-300-4 A9Z06440, AC-type, 40 A, 300 mA, 4-pole

Schneider Electric IDK-AC40-300-4 is an AC-type residual-current device rated for 40 A with a 300 mA trip sensitivity and four poles. It is designed to detect and interrupt alternating residual currents in three-phase systems with neutral, providing earth-leakage protection for distribution boards and industrial electrical installations where AC-only detection and a higher trip threshold are required. The compact, DIN-rail compatible form factor fits standard switchgear and distribution enclosures.

Advantages

This residual-current device provides selective disconnection for alternating leakage currents while supporting a nominal current of 40 A. Its 300 mA sensitivity reduces the risk of nuisance trips due to small leakage currents, making it suitable for applications with expected higher leakage levels. The four-pole configuration ensures coordinated protection across three phases plus neutral in TN and TT systems. Built to Schneider Electric quality standards, the device integrates with typical distribution systems and mounting practices.

Suitable for

• Three-phase distribution panels with neutral (4-pole configurations)
• Industrial installations where AC-only residual current detection is acceptable
• Circuits requiring earth-leakage protection with a 300 mA trip level
• Applications prioritizing reduced nuisance tripping in environments with higher leakage

Key specifications

• Type: AC-type residual-current detection (detects alternating residual currents)
• Rated current: 40 A
• Residual current sensitivity (trip threshold): 300 mA
• Poles: 4-pole (three phases + neutral)
• Mounting: DIN-rail compatible for standard distribution enclosures
• Primary function: Earth-leakage detection and disconnection for distribution circuits

How to use

Install the device in the distribution board on a standard DIN-rail ensuring correct orientation and secure terminal connections for the three phases and neutral. Connect line and load conductors to the appropriate terminals and tighten to the manufacturer’s recommended torque. Verify that the device’s trip rating and type match the circuit requirements and upstream/downstream coordination. After wiring, perform insulation and functional tests according to local electrical standards and confirm the device trips correctly under simulated leakage conditions before commissioning the circuit.

Usage recommendations

Use this AC-type residual-current device where detection of pure alternating residual currents is sufficient and where a 300 mA trip threshold is appropriate for selective protection. Do not rely on AC-type devices for detection of DC or pulsed residual currents; for scenarios with electronic loads or inverters that may produce residual DC components, consider a device with A- or B-type detection as required by applicable regulations.