ABB SD821 Key features
High Efficiency: It provides excellent energy efficiency, minimizing power losses and reducing operating costs.
Wide Input Voltage Range: The SD821 operates over a wide input voltage range, suitable for a wide range of applications.
Overload and Short Circuit Protection: The power supply incorporates protection measures to prevent overload and short circuit conditions.
Compact Size: It features a compact design for easy installation and space saving in applications.
Wide Operating Temperature Range: The SD821 is designed to operate reliably in extreme temperature conditions.
Reliable Performance: With its high-quality construction and advanced technology, the power supply delivers consistent and reliable performance.
Performance comparison
Feature | ABB SD821 | ABB SD822 | SD821 Advantage |
Output Voltage | 24V DC | 24V DC | Same |
Output Current | 20A (High load capacity) | 10A | Handles larger loads |
Redundancy Support | Yes (Fully redundant design) | Yes | Ideal for critical systems |
Application Level | High-performance / mission-critical | General-purpose | Built for demanding industrial control |
EMC/Environmental Robustness | Industrial-grade, high interference immunity | Standard protection | Reliable in harsh environments |
Typical Applications | Power plants, oil & gas, DCS core systems | Basic I/O and general equipment supply | Preferred for essential control modules |
Mounting | DIN rail | DIN rail | Same |
AC 800F Compatibility | Fully supported and recommended | Supported | Recommended for primary system power supply |
Typical cooperation cases
Power Generation Facilities
SD821 is widely used in thermal and combined-cycle power plants to provide stable 24V DC power to turbine control modules, safety interlocks, and emergency shutdown systems, ensuring uninterrupted operation of critical systems.
Oil & Gas Plants (Onshore and Offshore)
Deployed in control rooms and field stations to supply redundant power to PLCs, DCS I/O racks, and fire & gas systems. Its high current output and robustness support 24/7 uptime in harsh environments.
Water Treatment Plants
Powers automated control panels, valve actuators, and sensor hubs for large-scale pumping and filtration systems, supporting reliable process continuity and minimal manual intervention.
High-Availability Industrial Automation Systems
Integrated into manufacturing execution systems (MES) and distributed control layers where power reliability is essential for real-time production monitoring, safety relays, and alarm systems.
