ABB SD831 Power Supply Unit – 24V DC, 3A, DIN-Rail Mount

Introduction

When your control system demands a reliable, efficient power source, the ABB SD831 Power Supply Unit delivers consistent 24V DC output with robust protection features. This switch-mode power supply converts mains voltage to a stable 24V DC, supporting both non-redundant and redundant configurations. Its compact DIN-rail mounting simplifies installation in crowded cabinets.

Technical Specifications Breakdown

The SD831 operates with a nominal input of 100-240V AC or 110-300V DC, handling voltage variations of ±10% for AC and -20%/+25% for DC. It provides a rated output current of 3A and a rated output power of 72W, with an efficiency of 88/89.8% at full load. The output voltage regulation remains within <50mV at maximum current, and ripple (peak-to-peak) stays below 50mV, ensuring clean power for sensitive electronics. Over-voltage protection triggers at <39V, safeguarding connected equipment.

Industry Applications

In manufacturing lines, the SD831 powers PLCs, sensors, and actuators with stable 24V DC. Its soft-start feature prevents nuisance tripping of circuit breakers during power-on, reducing downtime. For process control systems requiring redundancy, pair two SD831 units with SS823 or SS832 diode voting modules to maintain uptime during power supply failure.

Installation & Setup Guidance

Mount the SD831 directly onto a standard DIN rail. Ensure proper spacing: allow 15mm width and 40mm height clearance around the unit for airflow. Connect the protective earth (PE) to meet Class I equipment requirements. No external mains filter is necessary. For redundant setups, wire the outputs through a diode voting unit before connecting to the load.

Maintenance & Reliability

The SD831 operates reliably in ambient temperatures up to 55°C. Its IP20 protection rating suits clean indoor environments. The unit’s over-current and over-voltage protection reduce the risk of damage from load faults. Periodic inspection of connections and ventilation ensures long service life. With a heat dissipation of only 10/8W, the power supply maintains cool operation even under full load.

Compatibility & Integration

It accepts both AC and DC inputs, making it versatile for global installations. The SD831 holds marine certifications from ABS, BV, DNV-GL, and LR, suitable for shipboard automation. Its EMC compliance with EN 61000-6-4 and EN 61000-6-2 ensures minimal electromagnetic interference.

Selection Guide & Purchasing Advice

Before ordering, verify your system’s voltage and current requirements against the SD831’s 24V DC, 3A output. For higher current, consider the SD834. Confirm input voltage compatibility: 100-240V AC or 110-300V DC. AutoDCSTech stocks the SD831 (3BSC610064R1) with fast shipping. Contact our team for lifecycle status and availability.