Description
Product Core Brief
- Model: SD821
- Ordering Code: 3BSC610037R1
- Brand: ABB
- Series: ABB AC800M / Industrial IT 800xA power module family
- Core Function: Converts AC input to regulated 24VDC for AC800M controller and S800 I/O stations.
- Product Type: AC/DC power supply module
- Key Specs: 24VDC output | 2.5A rated current | DIN-rail mount | Soft-start | Redundant-ready with SS822/SS823
- Condition: New Original (New Surplus) / Factory Sealed
Product Introduction
When a controller or I/O station loses its 24VDC supply, the entire control loop can trip. The ABB SD821 is a 2.5A switching power supply module used in ABB AC800M and S800 I/O applications, converting 115/230VAC input into stable 24VDC output for CPU racks, communication modules, and I/O loads.
This module matters because SD82x power supplies look similar but differ in output current rating. Using the correct 2.5A unit prevents under-sizing or unnecessary over-specification. Before ordering, confirm the existing module label, since SD821 (2.5A), SD822 (5A), and SD823 (10A) are not automatic like-for-like replacements without load verification.
Key Technical Specifications
- Part Designation:
- Ordering Code: 3BSC610037R1
- Brand: ABB
- Application: ABB AC800M controller and S800 I/O power supply
- Module Type: AC/DC switching power supply
- Input Voltage: 115/230VAC, selectable
- Output Voltage: 24VDC
- Output Current: 2.5A
- Mounting: DIN-rail / controller rack mounting
- Features: Soft-start, diagnostic support, redundant-ready when used with SS822/SS823 voting unit
- Operating Environment: Industrial control cabinet, typically 0…55 °C
- Condition: New Original (New Surplus) / Factory Sealed
- Note: Exact hardware revision and accessory requirements should be verified against the existing module nameplate and ABB documentation.
Key Selling Points & Differentiators
- Exact 2.5A match: Supplied as SD821 to support correct replacement without unnecessary up-rating.
- AC800M/S800-specified: Matches ABB controller and I/O power architecture.
- Redundant-ready: Can be used with SS822/SS823 for higher-availability power configurations.
- Factory-sealed supply: Shipped with ESD-safe handling and visual QA before dispatch.
- Not recommended for AC800F SD802F 24VDC redundant stations, ACS800/ACS880 drives, AC500 PLCs, or non-ABB controllers without confirmed compatibility.
Quality Transparency SOP
- Visual inspection: Check housing, DIN-rail clip, terminal blocks, and labeling for damage.
- ESD-safe handling: Packed in anti-static protection for sensitive electronics.
- Connector verification: Inspect AC input and 24VDC output terminals for corrosion or bent pins.
- Nameplate cross-check: Confirm SD821 and 3BSC610037R1 markings before shipment.
- Functional validation: When compatible test infrastructure is available, verify AC input, 24VDC output, LED status, and soft-start behavior. Full validation depends on the host controller or I/O station.
Technical Risk Avoidance
❗ Confirm output current rating. SD821 is rated at 2.5A. If the station uses SD822 (5A) or SD823 (10A), verify load requirements before substitution.
❗ Verify input voltage selector. The module supports 115/230VAC selection; incorrect setting can cause faults.
❗ Check redundancy configuration. If the rack uses SS822/SS823, ensure both power channels and wiring match the existing design.
❗ Follow LOTO procedures. AC input terminals carry hazardous voltage. Only qualified personnel should perform installation.
❗ Confirm platform compatibility. SD821 is intended for AC800M/S800 power applications and is not automatically interchangeable with AC800F SD802F 24VDC modules.
Buyer’s FAQ
Is this an original ABB part?
Yes. The listing is for ABB SD821, ordering code 3BSC610037R1, as a new original/new surplus, factory-sealed unit.
Which system does SD821 fit?
It is used in ABB AC800M and S800 I/O applications as a 24VDC power supply module converting 115/230VAC to 24VDC at 2.5A.
Can SD821 replace SD822 or SD823?
Not automatically. SD821 is 2.5A, SD822 is 5A, and SD823 is 10A. Substitution requires load and redundancy verification.
What condition is the unit?
New Original (New Surplus) / Factory Sealed, unless otherwise stated. Photos and batch details can be confirmed before dispatch.
Do you offer a warranty?
Yes. A standard warranty applies from receipt. Installation should be performed by qualified DCS or control-system personnel.
