Product Core Brief
- Model: SD833, Official OEM part code: 3BSC610066R1
- Brand: ABB Hitachi Energy
- Series: SD83x standard power supply series for ABB Ability System 800xA and AC800M distributed control systems
- Core Function: Compact DIN rail mounted switch-mode power supply unit designed to convert universal single-phase AC mains into stabilized 24 VDC SELV output power. It delivers steady 24 VDC logic power to AC800M controller CPUs, S800 remote I/O modules, PROFIBUS communication cards, HMIs and field transmitters in industrial, power generation and chemical process control cabinets. The supports both standalone non-redundant power architecture and redundant parallel power setups when paired with SS823 or SS832 diode voting modules. Built-in soft-start circuit eliminates large inrush current during power-on to avoid upstream fuse tripping, and integrated multi-layer protection circuits safeguard downstream DCS hardware from grid surge and overload damage.
- Product Type: DIN rail industrial switch mode power supply unit (PSU)
- Key Specs: Universal AC input 85–264 VAC 47–63 Hz; fixed 24 VDC output, rated 10 A / 240 W; built-in soft start; full galvanic isolation between primary mains and secondary 24V output; comprehensive OVP, OCP, overtemperature and short-circuit auto-recovery protection; no external mains filter required; SELV/PELV secondary circuit compliant; standard 35 mm DIN rail installation
- Note: Still active mass production for new System 800xA DCS projects and legacy plant renovation; factory-sealed original units and fully bench-load-tested surplus PSUs are widely supplied for thermal power plants, hydropower stations, offshore platforms, chemical factories and water treatment automation cabinet maintenance. The whole unit is IP20 enclosed and designed for indoor control room cabinet installation.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Full OEM Article Number | 3BSC610066R1 |
| AC Mains Input Range | 85 VAC ~ 264 VAC auto-ranging, 47–63 Hz single-phase |
| Nominal DC Output | 24 VDC stabilized SELV voltage |
| Rated Output Current | 10 A continuous |
| Total Rated Output Power | 240 W |
| Typical Efficiency | Up to 93.6% @ 120 VAC input, 95.2% @ 230 VAC input |
| Inrush Current Control | Soft-start circuit limits peak inrush to prevent breaker tripping |
| Built-in Protection Suite | Input overvoltage lockout, output constant current limiting, short-circuit auto shutdown with automatic recovery, heatsink overtemperature alarm & trip |
| Galvanic Isolation | Functional isolation between primary high-voltage mains and low-voltage 24V secondary, 3000 VAC isolation test voltage |
| Safety Classification | Class I equipment (requires PE protective earth connection), Overvoltage Category III |
| Secondary Circuit Approval | SELV / PELV compliant for safe low-voltage control signal loops |
| Front Panel Indicator | Single green OK LED (steady on = normal output; off/flashing = fault lockout) |
| Mechanical Mounting | Standard 35 mm DIN rail mounting |
| Overall Dimensions | 124 mm H × 60 mm W × 117 mm D |
| Net Weight | Approx. 700 g |
| Compliance Standards | EN 50178, EN 61131-2, UL 508, CE, RoHS, TUV type-tested |
Product Introduction
The is the standard medium-power 24V power supply for ABB System 800xA and AC800M DCS control cabinets, solving multiple critical power supply challenges for mission-critical process automation systems.Four core design advantages define its industrial performance:
- Universal Wide AC Input CompatibilityAuto-sensing mains circuit supports all global industrial single-phase AC voltages (110 V / 220 V / 240 V) without manual voltage selector switches, simplifying spare parts inventory for multi-region factories and power plants. Integrated EMI filter eliminates external filter installation cost and saves cabinet space.
- Soft Start Inrush Current LimitationConventional power supplies generate huge peak inrush current at power-on, which often trips upstream cabinet circuit breakers. ’s proprietary soft-start charging circuit slowly ramps up internal DC bus voltage, restricting peak inrush to a safe level and improving system startup stability.
- Dual Operation Modes: Single & Redundant Parallel
- Non-redundant layout: Single feeds all DCS control hardware for small single-rack systems;
- Redundant layout: Two units paired with SS823 / SS832 diode voting modules form fully redundant 24V power rails. If one PSU fails, the other takes full load without DCS communication interruption or process control outage.
- Full Self-Protection & Low Noise Stable OutputMulti-stage hardware protection instantly locks 24V output under overload, short-circuit, overvoltage or overheating conditions to avoid permanent damage to expensive CPU, I/O and fieldbus cards. The low-ripple 24V DC output eliminates analog signal measurement drift and random fieldbus communication faults caused by power supply noise.
It is widely matched with PM857 / PM866 AC800M controllers, S800 remote I/O modules, FI830 PROFIBUS interface cards and CB801 terminal base units. Without a functional , all connected DCS control hardware will lose power and stop executing process interlock and monitoring logic.
QA & Testing SOP (Transparency Building)
- Incoming Visual Inspection: Cross-check full part number 3BSC610066R1 and serial number against ABB DCS spare parts database to reject counterfeit mismatched power supplies; inspect front OK LED, mains input/output terminal blocks, internal switching circuit and housing for burn marks, discoloration or mechanical deformation; record serial numbers and production batches for full traceability.
- Full Load Bench Test: Mount on standard DIN rail test bench, supply variable 85–264 VAC mains input, connect 240 W simulated DCS load bank; run 24-hour cyclic testing including full-load continuous output, soft-start inrush simulation, short-circuit/overtemperature fault trigger and auto-recovery function, verify stable 24 VDC output voltage with minimal ripple under all input voltage conditions.
- Electrical Insulation Test: Use insulation resistance tester to confirm isolation resistance ≥ 10 MΩ between AC primary mains circuits and 24 VDC secondary output rails; test chassis ground continuity resistance below 0.5 Ω.
- Hardware Record Backup: Photograph input/output terminal pin definitions and DIN rail mounting positioning rules for field commissioning reference.
- Final QC Packaging: Wipe PSU housing with anti-static microfiber cloth, cover all terminal screw blocks with insulating dust caps, place the unit into independent ESD shielding bag, attach unified printed QC test tag with technician ID and full 24-hour full-load test runtime timestamp, then pack into foam shockproof carton for long-distance power plant transportation.
Installation Pitfalls & 4-Step Replacement Guide
Common Installation Hazards
❗ Residual High-Voltage Capacitor Risk: After cutting off mains AC power, wait minimum 10 minutes for internal primary and secondary capacitors to fully discharge before disassembly to avoid electric shock.❗ Redundant Wiring Mismatch Risk: For dual redundant power setup, two outputs must connect to a dedicated SS823/SS832 voting module; direct parallel connection without diode voting will cause cross-circuit power backflow and PSU premature failure.❗ PE Ground Connection Mandatory: is Class I safety equipment; missing protective earth wire will invalidate insulation safety certification and create electric shock risk during internal circuit failure.❗ ESD PCB Damage Risk: Wear certified anti-static wrist strap during all disassembly and installation work; bare hand contact with internal switching chips and output regulation circuits permanently impairs voltage stabilization accuracy and protection function.❗ Overload Load Matching Error: Do not connect total DCS load exceeding 240 W to one output; excessive load current will activate persistent overload protection and cut off 24V control power.
4-Step PSU Replacement Guide
- Pre-install Preparation: Lock out and tag out the cabinet AC mains power supply feeding the unit, wait 10+ minutes for internal capacitor complete discharge, wear ESD wrist strap, photograph AC mains input wiring and 24 VDC output load wiring sequences connected to DCS rack power distribution terminals.
- Removal Operation: Loosen all input/output terminal wire screws, release the DIN rail mounting clip, detach the old power supply unit from the cabinet DIN rail.
- Installation & Wiring: Clip the new onto the original DIN rail, replicate AC mains input polarity and 24 VDC output load wiring strictly following photographed sequence, tighten all terminal screws to ABB standard torque values; install SS823/SS832 voting module if redundant power architecture is required.
- Power-on Commissioning Test: Restore cabinet AC mains power, observe front green OK LED light steady on; measure output terminal voltage to confirm stable 24 VDC without fluctuation; connect full DCS controller and I/O load, run continuous no-load test for 1 hour, verify no persistent power fault alarms on DCS/SCADA system and stable fieldbus communication.
FAQ
Q: What is the difference between SD831, and SD834 power supplies?
- SD831: Low-power variant, 3 A / 72 W 24 V output, for small single I/O rack light load applications;
- : Medium-power standard version, 10 A / 240 W 24 V output, the most widely used model for full AC800M CPU + multi-I/O DCS bays;
- SD834: High-power heavy-load variant, higher output current for large multi-rack redundant DCS systems with dozens of fieldbus and I/O modules.All three series share identical DIN rail form factor and safety protection logic but cannot be cross-replaced without recalculating total cabinet power consumption.
Q: Can be hot-swapped with cabinet AC mains energized?Strictly prohibited. The PSU connects directly to live high-voltage AC mains circuits and internal charged DC bus capacitors; disassembly under energized conditions will generate severe arc flash and permanent damage to internal switching semiconductors. Full mains power lockout and capacitor discharge are mandatory before replacement.
Q: What warranty applies to stocked 3BSC610066R1 units?Factory-new original power supplies carry 12-month official ABB manufacturer warranty covering AC-DC conversion circuits, output regulation loop, soft-start hardware and protection logic. Bench-tested surplus units provide 6-month functional warranty; damage caused by residual high voltage shock, PE ground disconnection, overload sustained operation or ungrounded ESD handling voids all warranty terms.
Q: Has ABB discontinued production?No formal EOL notice issued; remains standard supply for new ABB 800xA DCS control room projects and legacy plant spare parts maintenance. New compact edge control systems adopt smaller low-power SD831 variants for limited I/O load layouts.
Q: What typical faults indicate a defective unit?Common failure symptoms: Front OK LED off after mains power restoration with normal AC input, unstable fluctuating 24 VDC output voltage, DCS controller random restarts under partial load, persistent overload fault lockout without excessive connected load, overheating PSU housing during normal operation, and total loss of 24V power to all downstream CPU and I/O hardware.
