Description
1. Product Description
The ABB TB852 3BSC950263R1 is an RCU Link Terminator designed for ABB AC 800M controller systems and System 800xA distributed control system (DCS) installations. It terminates the RCU communication link to help prevent signal reflections and maintain reliable communication between compatible control-system components.
The TB852 is a passive bus accessory rather than a CPU, I/O module, or standalone controller. It is used with compatible RCU Link connections according to the system configuration. Correct termination is important for communication stability, particularly in redundant controller installations and legacy automation systems.
TB852 3BSC950263R1
2. Product Parameters — Datasheet
Brand: ABB
Model: TB852
Order Number: 3BSC950263R1
Product Name: RCU Link Terminator
Product Series: ABB AC 800M / System 800xA
Product Type: Communication Bus Accessory
Primary Function: RCU Link bus termination
Application: Industrial DCS and controller communication systems
Compatible System: ABB AC 800M and compatible RCU Link configurations
Connector Type: Verify the connector configuration against the original unit and system documentation
Termination Resistance: Not independently confirmed from the manufacturer catalog; verify the applicable hardware documentation
Power Requirements: No separate power supply is normally required for a passive terminator
Dimensions: Not confirmed in the manufacturer catalog
Weight: Not confirmed; varies by catalog and packaging
Place of Manufacture: Not confirmed for the individual unit
Country of Origin: Verify from the product label
Product Status: Depends on supplier inventory; new surplus or used stock may be available
Discontinued: Current lifecycle status not confirmed
Installation: Install only at the designated RCU Link termination point according to ABB system documentation
Compatibility: Confirm the RCU Link type and controller configuration before installation
3. Recommended ABB Models
The following ABB products are related communication accessories and controller components for AC 800M and System 800xA applications. They are not direct replacements for TB852 unless the system documentation explicitly specifies the alternative.
- ABB TB850 — 3BSC950193R1: CEX-Bus terminator with a 25-pin male connector.
- ABB TB851 — 3BSC950194R1: CEX-Bus terminator with a 25-pin female connector.
- ABB TB853 — 3BSE057022R1: RCU Control Link Terminator.
- ABB TK851V010 — 3BSC950262R1: One-meter connection cable used for RCU Link and BC810 interconnection.
- ABB TK855 — 3BSC950356R1: One-meter RCU Data Link cable for supported configurations.
- ABB TK856 — 3BSE057021R1: One-meter RCU Control Link cable for supported configurations.
- ABB TK857V003 — 3BSC950375R1: Short RCU Link cable used with BC820.
- ABB BC810: CEX-Bus interconnection unit for compatible AC 800M systems.
- ABB BC820: RCU-Link and CEX-Bus interconnection unit for supported redundant controller configurations.
- ABB BC820K02 — 3BSE071500R1: RCU-Link and CEX-Bus interconnection package.
- ABB PM858: AC 800M controller for industrial process automation.
- ABB PM862: AC 800M controller used in supported process-control configurations.
- ABB PM866: AC 800M controller for DCS and industrial automation.
- ABB PM891: AC 800M high-performance controller used with compatible RCU communication accessories.
- ABB TK850V007 — 3BSC950192R1: CEX-Bus extension cable for compatible communication-interface installations.
For replacement procurement, match the exact TB852 / 3BSC950263R1 order number and confirm the intended RCU Link connection. Do not substitute a CEX-Bus terminator or an RCU Control Link terminator solely because its name is similar.
