ABB TK821V020 3BSC950202R1 | Prefabricated Connection Cable for AC 800M Battery Backup

Description

ABB TK821V020 3BSC950202R1 – Prefabricated Connection Cable for AC 800M Battery Backup

Product Overview

The ABB TK821V020 (ordering code 3BSC950202R1) is a factory-terminated, prefabricated connection cable engineered specifically for ABB AC 800M series controllers within the System 800xA distributed control platform-. This industrial-grade assembly serves as the dedicated physical link between the controller and its external backup battery unit—typically the SB822 DIN-rail mounted rechargeable battery pack-30.

The primary function of the 3BSC950202R1 is to maintain a stable, low-resistance DC power path from the backup battery to the controller’s volatile memory and real-time clock circuits-18-21. During unexpected mains power interruptions, this connection ensures that application software, firmware, configuration parameters, and time-stamped data remain intact—preventing costly system re-initialization and process downtime-21. The cable’s fixed 2.0-meter length-18 is calibrated to provide the specific electrical loop impedance required by the CPU charging sub-circuits, while allowing flexible placement of the battery unit away from heat-generating logic cards-18. As a fully passive assembly containing no active electronics, the TK821V020 requires no software configuration or firmware provisioning—simply plug and protect-18.

Technical Specifications — TK821V020 3BSC950202R1

Parameter	Value
Product Model	TK821V020
Order Number	3BSC950202R1
Manufacturer	ABB
Product Type	Prefabricated Battery Connection Cable
Cable Length	2.0 m (6.56 feet) fixed-18
Net Weight	Approx. 0.10 – 0.42 kg-18-21
Operating Temperature	–25°C to +70°C-21
Storage Temperature	–40°C to +85°C-21
Country of Origin	Sweden-18-21
System Compatibility	ABB AC 800M Controller Family / System 800xA-21
Primary Application	Backup battery connection for volatile memory retention
Connector Type	Proprietary ABB connectors, gas-tight vibration-proof fit-21
Compliance	RoHS, REACH compliant-
Customs Tariff	85389099 (Parts for control apparatus)-18
WEEE Category	Not in WEEE scope-18

ABB TK821V020 3BSC950202R1

Key Features and Benefits

Guaranteed Memory Retention During Power Loss
The 3BSC950202R1 provides an uninterrupted, low-impedance power path from the backup battery to the controller’s volatile RAM and real-time clock-18. This prevents loss of application software, firmware, and configuration data during unplanned outages—eliminating the need for time-consuming system reloads-21.

Factory-Terminated Reliability
Unlike field-assembled cables that introduce variability in termination quality and shield bonding, the TK821V020 is factory-terminated to ABB’s exact specifications-17. This eliminates guesswork from pinouts, ensures consistent shield continuity, and reduces installation time during commissioning-17.

Optimized 2-Meter Length for Panel Flexibility
The fixed 2.0 m length allows engineers to mount the backup battery unit away from the primary controller’s heat sources or in accessible maintenance areas of the cabinet-21. This design consideration simplifies cabinet layout and improves serviceability without compromising electrical performance-18.

Industrial-Grade Shielding and Insulation
High-quality shielding protects the power transmission from electromagnetic interference generated by variable frequency drives and high-current feeders-21. The robust insulation withstands ambient temperatures up to 70°C, ensuring reliable operation in harsh process environments-17.

Vibration-Proof Connector Design
Proprietary ABB connectors provide a gas-tight, vibration-proof fit that prevents accidental disconnection in high-vibration settings such as pulp & paper mills or oil & gas facilities-21. This mechanical integrity is critical for maintaining system availability in demanding industrial applications.

Swedish Build Quality and Traceability
Manufactured to original factory tolerances in Sweden, the TK821V020 meets the exact gauge and material specifications required by the AC 800M family-21. Generic substitutes risk voltage drops, improper regulation, or connector failure—compromising the very system integrity this cable is designed to protect-21.

Related Models

SB822 – External DIN-rail mounted rechargeable battery unit for AC 800M controllers, including lithium-ion battery, 24V DC connector, and the TK821V020 connection cable-30.

TK821V010 – Shorter variant of the same cable series, typically used for compact cabinet installations where a 1-meter reach is sufficient.

TK821V030 – Extended-length variant for larger cabinet-to-cabinet runs, providing additional flexibility in distributed I/O architectures.

TK821V020 (20-meter variant) – A separate factory-terminated system cable (same base model number) used for AC 800M to S800 I/O expansion connections, with a 20-meter reach for cross-panel runs-17.

BC810 – Battery control unit that pairs with the SB822 and TK821V020 to provide comprehensive memory backup and battery health monitoring for AC 800M controllers.

Installation and Maintenance

The 3BSC950202R1 installs as a straightforward plug-and-play connection between the AC 800M controller and its external backup battery unit-18. No software configuration, firmware provisioning, or special tools are required—simply route the cable from the battery pack to the designated connector on the controller, maintaining a gentle bend radius (at least 10× cable outer diameter) to protect internal pairs and shielding-17.

For optimal performance, the cable should be routed separately from motor cables and VFD outputs to minimize electromagnetic interference-17. Ensure the factory shield termination remains intact and bond per ABB grounding guidelines-17. The cable contains no active electronics or memory registers, making it a purely passive component with virtually zero maintenance requirements beyond periodic visual inspection of connector integrity and insulation condition-18. When replacing the backup battery unit, always disconnect the TK821V020 before handling the battery to prevent accidental short circuits.