DCS Backup Power Solution – ABB SB821 3BSE018109R1 | AC800M Series
Where This Product Is Used
The ABB SB821 (3BSE018109R1) Battery Unit is purpose-built for mission-critical industrial automation environments where uninterrupted controller operation is non-negotiable. Typical deployment sites include:
- Oil & Gas Processing Plants – Maintains DCS controller integrity during grid fluctuations or planned shutdowns at upstream/downstream facilities.
- Chemical & Petrochemical Facilities – Provides ride-through power to AC800M controllers managing reactor loops, distillation columns, and safety interlocks.
- Power Generation & Utilities – Supports turbine control and SCADA-linked AC800M nodes during switchgear transitions or UPS handoff delays.
- Pulp & Paper Mills – Protects process continuity for AC800M-based machine drive and quality control systems.
- Water & Wastewater Treatment – Ensures SCADA/DCS controller availability during utility power interruptions at pump stations and treatment plants.
- Pharmaceutical Manufacturing – Supports GMP-compliant batch control systems where unexpected controller resets can invalidate production records.
Technical Specifications
| Part Number | SB821 |
| ABB Order Code | 3BSE018109R1 |
| Series | AC800M / Advant Controller 800 |
| Module Type | Battery Backup Unit |
| Compatible Controllers | PM851, PM856, PM860, PM861, PM864, PM866 (AC800M family) |
| Weight | 4,460 g (approx.) |
| Mounting | DIN rail / S800 I/O backplane compatible |
| Function | Provides backup power to retain controller memory and maintain operation during mains power loss |
| Manufacturer | ABB Ltd. (Switzerland) |
| HS Code | 8507.60 (Lithium-ion accumulators / battery modules) |
Why Engineers Specify This Model
- Seamless Failover – The SB821 activates automatically on mains loss, preventing controller resets and preserving live process data without operator intervention.
- OEM-Matched Compatibility – Designed exclusively for the AC800M platform; no firmware patches or adapter brackets required.
- Memory Retention – Keeps volatile RAM contents intact across power events, eliminating the need for cold-start re-initialization of complex control programs.
- Reduced Downtime Risk – In regulated industries (pharma, food & beverage), an unexpected controller reset can trigger costly batch failures or compliance deviations — the SB821 eliminates this risk.
- Long Service Life – ABB-grade battery chemistry and thermal management extend replacement intervals compared to generic alternatives.
Complete System Bill of Materials
The SB821 is typically deployed alongside the following AC800M components:
- ABB PM864A / PM866 – AC800M Process Controller CPU
- ABB TB840A – ModuleBus Optical Modem (for remote I/O)
- ABB SM811 / SM812 – Serial Communication Interface Module
- ABB CI854A – PROFIBUS DP Communication Interface
- ABB S800 I/O Modules (AI810, AO810, DI810, DO810 series)
- ABB PS800 – Power Supply Unit for AC800M rack
Contact us to source complete AC800M system builds or individual replacement modules.
Compliance & Industry Standards
- Designed and manufactured to IEC 61131-2 (Programmable Controllers – Hardware Requirements)
- Compatible with IEC 61511 (Functional Safety – Safety Instrumented Systems) architectures when used with certified AC800M controllers
- CE Marked for European market compliance
- RoHS-compliant manufacturing (ABB factory standard)
- Suitable for use in ATEX Zone 2 adjacent control rooms when installed per ABB system documentation
Quality Assurance & Sourcing
- Authentic ABB Hardware – All units sourced from authorized ABB distribution channels or verified surplus with full traceability documentation available on request.
- Pre-Shipment Inspection – Each SB821 unit undergoes visual inspection, label verification, and functional check before dispatch.
- Secure Packaging – Anti-static ESD packaging with foam cushioning to protect battery cells and PCB connectors during international transit.
- Warranty – 12-month warranty against manufacturing defects. Replacement or full refund issued for verified DOA units.
How to Source This Part
- Add to Cart – Click “Add to Cart” above to purchase directly. We accept T/T bank transfer, PayPal, and major credit cards.
- Request a Quote – For bulk orders (5+ units) or project BOM sourcing, email support@konmask.com for volume pricing.
- Urgent Requirement – Call or WhatsApp +0086 19859288691 for same-day quotation and expedited shipping options.
- Lead Time – In-stock units ship within 1–3 business days. Ex-stock availability confirmed at time of order.
Application-Specific FAQ
Q: Is the SB821 compatible with all AC800M controller variants?
A: The SB821 is compatible with the PM851, PM856, PM860, PM861, PM864, and PM866 processor modules. Always verify your specific PM model against ABB’s system compatibility matrix before ordering.
Q: How long does the SB821 provide backup power?
A: Backup duration depends on the connected controller load. Refer to ABB System Guide 3BSE036351 for detailed runtime calculations based on your AC800M configuration.
Q: Can I replace the SB821 battery while the controller is running (hot-swap)?
A: Hot-swap capability depends on your AC800M redundancy configuration. In non-redundant setups, a brief controller maintenance window is recommended. Consult ABB’s AC800M Hardware Manual (3BSE036351) for your specific topology.
Q: What is the recommended replacement interval?
A: ABB recommends periodic battery health checks per your site’s preventive maintenance schedule. Typical service life is 3–5 years depending on ambient temperature and charge/discharge cycles.
Q: Do you provide a certificate of conformity or test report?
A: Yes. Documentation packages including CoC, inspection reports, and sourcing traceability are available upon request for regulated industries.
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