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ABB SD831 power supply module

1. Product Description

The ABB SD831 is a high - performance switch - mode power supply module meticulously crafted for industrial automation and process control systems. Its core function is to convert incoming electrical power into a stable 24 V DC output, with a rated output current of 3 A. This makes it a reliable power source for a wide array of low - voltage DC - powered industrial devices, including ABB S500 series PLCs, AC 800M DCS components, sensors, and actuators.

Compliant with rigorous international standards such as EN 50178, EN 61131 - 2, and UL 508, the SD831 guarantees electrical safety and consistent operation. What sets it apart is its unique input flexibility. It can automatically adapt to a broad range of input voltages, accommodating either 100 - 240 V AC or 110 - 300 V DC. This versatility allows for seamless integration into diverse power systems across different regions and industrial settings, eliminating the need for external voltage conversion equipment in most cases.

Engineered with ruggedness and ease - of - installation in mind, the SD831 can be effortlessly mounted on a standard 35 mm DIN rail, adhering to the EN 50022 standard. This DIN - rail mounting not only optimizes space utilization within control cabinets but also enables quick and secure installation, significantly reducing the time and effort required for system deployment. The module is suitable for both non - redundant and redundant power applications. In redundant setups, it can be connected to diode voting units like the SS 823 or SS 832, enhancing system reliability by providing backup power in the event of a primary power supply failure.

2. Detailed Parameters

Parameter Category	Specifications
Model Number	SD831
Product Type	Power Supply Module
Input Voltage	100 - 240 V AC ± 10% or 110 - 300 V DC (- 20% / + 25%)
Output Voltage	24 V DC
Rated Output Current	3 A
Rated Output Power	72 W
Rated Input Power	134 / 143 VA
Efficiency	88% / 89.8%
Mains Frequency	50 – 60 Hz ± 6%
Ripple (Peak - to - Peak)	< 50 mV
Over - voltage Protection	< 39 V
Peak Inrush Current	< 28 A / < 54 A
Power Factor	0.61 / 0.56 at rated output power
Heat Dissipation	10 W / 8 W
Secondary Voltage Hold - up Time	29 ms / 120 ms at mains blackout
Operating Temperature Range	- 20 °C to + 55 °C
Storage Temperature Range	- 40 °C to + 80 °C
Relative Humidity	0 to 95% (non - condensing)
Protection Class	IP20
Mounting Method	DIN rail mounting (EN 50022 standard)
Compliance	EN 50178, EN 61131 - 2, UL 508
Over - voltage Category	III for connection to primary main
Protective Separation	Secondary circuit from primary circuit
Output Protection	Over - current protection
Redundancy Support	Requires diode voting units (SS 823 or SS 832) for redundant applications
Dimensions (W×H×D)	Compact design for DIN - rail mounting (dimensions optimized for standard 35 mm DIN rail, approximate: 48.3 mm × [suitable height] × [suitable depth])
MTBF (Mean Time Between Failures)	> 40,000 hours
Short Circuit Current	4 – 8 A
Primary Recommended Fuse	10 – 20 A

3. Advantages & Features

Dual - Input Voltage Flexibility

The ability to accept both AC (100 - 240 V) and DC (110 - 300 V) inputs makes the SD831 an extremely versatile power supply module. This is particularly beneficial in industrial plants where different power sources may be available or in scenarios where there is a need to quickly adapt to changing power supply requirements. For example, in a factory that has both standard AC power and a backup DC power system for critical operations, the SD831 can be used without the need for complex voltage - conversion setups, reducing system complexity and cost.

High - Efficiency Power Conversion

With an efficiency rating of 88% - 89.8%, the SD831 minimizes power losses during the conversion process. This not only leads to energy savings but also reduces heat generation. In an enclosed control cabinet where multiple power - consuming devices are operating, the reduced heat output helps in maintaining a stable temperature, which is crucial for the long - term reliability of all components. The high - efficiency design also contributes to lower overall energy costs for industrial facilities, aligning with sustainable energy practices.

Robust Protection Mechanisms

Built - in over - current protection safeguards the module and the connected devices from damage due to excessive current draw. In case of a short - circuit or over - load situation, the over - current protection activates to prevent overheating and potential component failures. Additionally, the over - voltage protection, which limits the output voltage to less than 39 V, protects the connected equipment from voltage surges. The protective separation between the primary and secondary circuits provides electrical isolation, enhancing operator safety and ensuring reliable operation in electrically noisy environments.

Soft - Start Feature

The SD831 is equipped with a soft - start function. When the power supply is turned on, it gradually ramps up the output voltage, preventing sudden high - current surges that could trip fuses or earth - fault circuit breakers. This is especially important in industrial settings where sensitive equipment may be connected to the power supply. For instance, in a precision manufacturing line with delicate sensors and actuators, the soft - start feature of the SD831 ensures a smooth power - on process, minimizing the risk of equipment damage due to electrical transients.

Easy Installation and Maintenance

The DIN - rail mounting design of the SD831 allows for quick and tool - less installation in standard control cabinets. This simplifies the initial setup of industrial control systems. In case of maintenance or replacement, the module can be easily removed and replaced without having to re - wire the entire system. The long MTBF of over 40,000 hours indicates its high reliability, reducing the frequency of maintenance and replacement requirements. The built - in compliance with relevant standards also eliminates the need for additional mains filters, further streamlining the installation process.

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