Product Overview
SD831 Power Supply Units convert mains voltage to 24 V d.c. with high efficiency (88/89.8%). They meet EN 50178, EN 61131-2, and UL 508 for electrical safety. The secondary output is accepted for SELV or PELV applications. These switch-mode units support both non-redundant and redundant setups (with SS823 or SS832 voting units). No mains filter is required; the soft-start feature prevents tripping fuses or earth-fault circuit breakers.
Key Features & Benefits
- Simple DIN-rail mounting, Class I Equipment (with PE connection)
- Over-voltage Category III for primary mains (TN network)
- Protective separation between primary and secondary circuits
- Output protected against over-current (current limit) and over-voltage (OVP < 39 V)
- Accepts both a.c. (100-240 V) and d.c. (110-300 V) input
- Ambient temperature up to 55 °C, IP20 rating (IEC 60529)
- Marine certifications: ABS, BV, DNV-GL, LR
Technical Specifications
| Brand | ABB (original manufacturer) |
| Model | SD831 |
| Article Number | 3BSC610064R1 |
| Type | Switch-mode power supply |
| Rated Output Current | 3 A (max. 3.3 A) |
| Rated Output Power | 72 W |
| Rated Output Voltage | 24 V d.c. |
| Rated Input Power | 134/143 VA |
| Mains/Input Voltage | 100-240 V a.c. (±10%) / 110-300 V d.c. (-20%/+25%) |
| Mains Frequency | 50-60 Hz (±6%) |
| Efficiency | 88% / 89.8% |
| Primary Peak Inrush Current | <28 / <54 A |
| Power Factor | 0.61 / 0.56 |
| Heat Dissipation | 10 / 8 W |
| Output Voltage Regulation | < 50 mV / < 100 mV at max. current |
| Ripple (peak-to-peak) | < 50 mV |
| Holdup Time (mains blackout) | 29 / 120 ms |
| Over-voltage Protection | < 39 V |
| Recommended External Fuse (Primary) | 10-20 A |
| Short-circuit Protection (Secondary) | 4-8 A |
| Ambient Temperature | max. 55 °C |
| Protection Rating | IP20 (IEC 60529) |
| Pollution Degree | Degree 2 (IEC 60664-1) |
| Corrosive Atmosphere | ISA-S71.04 G2 |
| Overvoltage Category | Category III (IEC/EN 60664-1) |
| Equipment Class | Class 1 (EN 50718; 3.56) |
| RoHS Compliance | DIRECTIVE/2011/65/EU (EN 50581:2012) |
| WEEE Compliance | DIRECTIVE/2012/19/EU |
| Dimensions (W x D x H) | 32 x 102 x 124 mm (1.26″ x 4.02″ x 4.88″) |
| Weight | 430 g (0.9 lbs) |
| Mounting Spacing (W / H) | 15 mm / 40 mm |
Installation & Compatibility
Mounting: Simple DIN-rail (35 mm). Ensure Class I grounding (Protective Earth). Leave 15 mm (W) and 40 mm (H) clearance for ventilation.
Input Compatibility: Accepts 100-240 V a.c. (±10%) and 110-300 V d.c. (-20%/+25%). No external mains filter needed.
Redundancy: Use diode voting units SS823 or SS832 for redundant applications.
Diagnostic Capability: Output protected against over-current and over-voltage; soft-start prevents nuisance tripping.
Environmental & Certifications
- CE Mark – yes
- Electrical Safety: IEC 61131-2, UL 508, EN 50178
- Marine: ABS, BV, DNV-GL, LR
- EMC: EN 61000-6-4 and EN 61000-6-2
- Hazardous Locations: Not rated (ATEX/IECEx/Class 1 Div 2 – no)
- Mechanical operating conditions per IEC 61131-2
Typical Applications
- Industrial automation control panels
- PLC and I/O power supply
- Marine and offshore equipment
- Factory floor machinery
- Process control systems
FAQ – Frequently Asked Questions
Q: Can I use SD831 in redundant configuration?
A: Yes, with SS823 or SS832 diode voting units.
Q: Does it require a mains filter?
A: No, the unit has built-in filtering.
Q: What is the holdup time?
A: 29 ms at 100 V a.c. / 120 ms at 240 V a.c.
Q: Is it suitable for marine use?
A: Yes, it holds ABS, BV, DNV-GL, and LR certifications.
Q: What is the recommended fuse?
A: Primary: 10-20 A; Secondary short-circuit protection: 4-8 A.
Why Buy From Oiltech Controls?
- Over 15 years of experience in industrial automation spare parts
- Global shipment support with FedEx, UPS, DHL
- Tested industrial surplus / refurbished options available
- 12-month warranty on all products
- Technical verification before shipment ensures reliability
- Support for obsolete control systems and legacy equipment
Ordering & Delivery
Packaging: Each SD831 unit is shipped in anti-static packaging with mounting instructions.
Warranty: 12 months from date of purchase against manufacturing defects.
Shipping: We ship worldwide via FedEx, UPS, or DHL – tracking provided.
Contact Information
Email: info@oiltechcontrols.com
WhatsApp: +86 158 8020 0923
Copyright © 2026 Oiltech Controls Limited. All rights reserved.
Original Source: https://www.oiltechcontrols.com/
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