Schneider AEG ALU821
Overview
The ALU821 is a module belonging to the AEG series under Schneider Electric. Housed in an aluminum alloy enclosure, it delivers excellent heat dissipation performance and protection rating, making it ideal for long-term operation in harsh industrial environments.
Main Specifications
- Rated Voltage: 400 V AC (230 V AC optional)
- Rated Current: 16 A / 32 A (selectable based on specific model)
- Power: Up to 7.5 kW (depending on current rating)
- Protection Rating: IP20 (for internal use) or IP54 (for enclosure protection)
- Operating Temperature Range: -25 °C to +55 °C
- Mounting Method: DIN rail or panel mounting, equipped with standard screw holes
- Connection Method: Screw terminals, spring terminals or quick-connect terminals available
Product Features
- Lightweight Aluminum Alloy Structure
It reduces weight by approximately 30% compared with traditional steel modules, facilitating easy handling and installation.
- Modular Design
It allows flexible combination of different functional units (relays, contactors, indicator lights, etc.) to meet diverse power distribution requirements.
- High Heat Dissipation Performance
The aluminum alloy enclosure is integrated with heat sinks, which lowers internal temperature rise and enhances operational reliability.
- Protection & Safety
Compliant with IEC 60947 standards, it provides overload and short-circuit protection. Its protection rating meets the dust and water resistance requirements of industrial sites.
- Easy Maintenance
Terminals adopt spring or screw type, enabling quick assembly and disassembly for convenient on-site inspection, repair and replacement.
Structure & Components
- Enclosure: Aluminum alloy chassis fitted with protective cover and heat sinks.
- Internal Electrical Units: Including main contacts, auxiliary contacts, coils, fuse holders, indicator light holders, etc.
- Terminal Block: Offers multiple terminal types (screw, spring, quick-connect) to accommodate connection of different cable specifications.
- Mounting Accessories: DIN rail clips, panel screws, junction boxes, etc.
Typical Application Fields
- Industrial Automation: Production line control cabinets, robotic systems, CNC machine tools.
- Energy Management: Distribution boxes, front-end protection of frequency converters, grid connection of photovoltaic inverters.
- Building Facilities: Air conditioning systems, lighting control, fire pump stations.
- Transportation: Rail transit power supply, airport ground support equipment.
Installation & Maintenance Guidelines
- Pre-installation Inspection
Verify that the power supply voltage and rated current match the module specifications; check the firmness of DIN rail or panel fixation.
- Wiring Specifications
Use wire cross-sections compliant with IEC 60364 standards, ensure terminals are fastened securely to avoid poor contact caused by loosening.
- Protection Measures
In humid or dusty environments, select enclosures with IP54 protection rating and ensure proper grounding.
- Heat Dissipation Inspection
Keep the area between heat sinks and enclosure free of obstacles to maintain ventilation; install forced air cooling if necessary.
- Regular Maintenance
Inspect terminal tightness, indicator light functionality and internal insulation status every 6–12 months; replace faulty units promptly if abnormalities are detected.

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