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
This power supply integrates seamlessly with ABB AC500 PLCs and other 24V DC industrial equipment. 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. SpareTechPLC stocks the SD831 (3BSC610064R1) with fast shipping. Contact our team for lifecycle status and availability.
Frequently Asked Questions
Q: Can the SD831 be used in redundant power supply configurations?
A: Yes. For redundant operation, use two SD831 units with ABB diode voting modules SS823 or SS832 to combine outputs.
Q: What is the maximum ambient temperature for the SD831?
A: The SD831 operates safely at ambient temperatures up to 55°C.
Q: Does the SD831 require an external mains filter?
A: No. The SD831 is designed without the need for an external mains filter.
Q: What certifications does the SD831 hold?
A: It complies with IEC 61131-2, UL 508, EN 50178, and has marine certifications from ABS, BV, DNV-GL, and LR.
Q: What is the holdup time during a mains blackout?
A: The secondary voltage holdup time is 29/120 ms, depending on input conditions.
