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- PCBA Assembly
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Product Overview
The ABB 1SFB527068D7085 AF Contactor PCBA Assembly is an electronic circuit board assembly used inside compatible ABB high-current AF contactors. It is a replacement component for the contactor’s internal electronic circuitry rather than a complete contactor or a standalone motor-control device.
This PCBA assembly is associated with the ABB AF1350, AF1650, and AF2050 contactor models, with specific configurations also covered by the applicable installation documentation. The board is installed within the contactor housing and connects to the designated internal terminals and wiring points. Its correct operation depends on the contactor model, internal configuration, and applicable assembly revision.
The 1SFB527068D7085 part number is particularly relevant when servicing legacy AF contactors. ABB’s assembly instructions identify it as a replacement for the earlier 1SFB527068D7005 and 1SFB527068D7015 circuit boards for contactors within the specified serial-number range. The instructions distinguish assemblies for contactors with serial numbers up to 1S160100517121223 from the later configuration beginning at 1S160100517121224.
For maintenance engineers, this distinction matters when identifying a replacement board. Matching the contactor’s complete model designation and serial number helps prevent the installation of an incompatible PCBA assembly. The board should be replaced according to the applicable contactor assembly instructions rather than selected solely by visual similarity.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Product Type | AF Contactor PCBA Assembly |
| Model | 1SFB527068D7085 |
| Product Family | ABB AF Contactors |
| Component Type | Printed Circuit Board Assembly |
| Component Function | Internal electronic assembly for compatible AF contactors |
| Compatible Contactor Models | AF1350, AF1650, AF2050; applicable T variants subject to configuration verification |
| Replacement References | 1SFB527068D7005, 1SFB527068D7015 |
| Installation Location | Inside the compatible contactor housing |
| Fastening Tool | Torx T25 |
| Specified Screw Tightening Torque | 4 Nm |
| Dimensions | 155 × 30 × 100 mm |
| Weight | 0.45 kg |
Product Features
- Dedicated PCBA assembly: Provides a model-specific internal electronic circuit board for compatible ABB AF contactors.
- AF contactor integration: Supports servicing of designated high-current contactor configurations.
- Replacement-part identification: Uses a unique ordering number to distinguish the assembly from other contactor electronic boards.
- Defined replacement history: Replaces specified earlier PCBA part numbers for contactors within the applicable serial-number range.
- Internal connector arrangement: Uses designated connections that must be matched to the corresponding contactor configuration.
- Service-oriented construction: Allows the circuit board assembly to be replaced during contactor maintenance when authorized by the applicable procedure.
- Controlled fastening requirements: The assembly instructions specify a Torx T25 tool and a 4 Nm tightening torque for the illustrated fastening operation.
Working Principle
The 1SFB527068D7085 operates as part of the electronic assembly inside a compatible ABB AF contactor. It is not a complete switching device and cannot independently interrupt the main power circuit. Its function depends on the electrical design of the contactor in which it is installed.
ABB AF contactors use electronically controlled coil technology. The contactor’s electronic system manages the coil’s operating conditions so that the main contacts can close or open in response to the applicable control command. The PCBA assembly forms part of the internal electronic arrangement required by the relevant contactor configuration.
A simplified operating sequence is:
Control Command → Contactor Electronic Circuitry → Coil Operation → Main Contact Movement → Power Circuit Switching
When a valid operating command is applied, the contactor’s internal electronic circuitry controls the coil according to the design of the installed model. The resulting magnetic force operates the contact mechanism, allowing the main contacts to establish or interrupt the power connection.
The PCBA assembly must be correctly connected to the designated internal wiring points. Incorrect connector placement, a mismatched board revision, or poor electrical contact can prevent the contactor from operating correctly.
When servicing the assembly, technicians should identify the contactor model and serial number before removing the existing board. The replacement must match the applicable circuit-board configuration, connector arrangement, and internal wiring layout. After installation, the contactor should undergo the prescribed functional checks before being returned to service.
Role in the ABB AF Contactor Control Architecture
The 1SFB527068D7085 is an internal electronic component in the control arrangement of compatible ABB AF contactors. It contributes to the electronic operation of the contactor, while the complete device performs the actual switching of the connected power circuit.
Control Circuit → Contactor Electronic Assembly → Coil and Operating Mechanism → Main Contacts → Connected Electrical Load
| System Component | Function |
|---|---|
| 1SFB527068D7085 PCBA Assembly | Provides the specified internal electronic circuitry for compatible contactor configurations |
| ABB AF Contactor | Establishes or interrupts the main power circuit |
| Contactor Coil | Generates the magnetic force needed to operate the contact mechanism |
| Main Contacts | Carry or interrupt current in the connected power circuit |
| Auxiliary Contacts | Provide status or interlocking signals where fitted |
| Control Power Circuit | Supplies the operating command and required control energy |
| Motor Protection Equipment | Protects the associated motor circuit according to the installed protection scheme |
| External Control System | Issues switching commands through the configured control circuit |
The PCBA assembly does not replace the complete contactor, motor protection device, or external control system. Its function is specific to the internal electronics of the compatible host contactor.
Industrial Applications
| Application | Typical Use |
|---|---|
| Industrial Motor Control | Servicing compatible AF contactors used in motor circuits |
| Manufacturing Facilities | Maintaining contactor assemblies in production equipment |
| Pumping Systems | Supporting maintenance of contactors used in pump motor starters |
| Industrial Compressors | Servicing compatible contactor assemblies in compressor electrical systems |
| HVAC Equipment | Maintaining suitable high-current contactor installations |
| Conveyor Systems | Repairing contactor assemblies used in motor-driven transport equipment |
| Process Plants | Maintaining electrical switching equipment in industrial control panels |
| Power Distribution Panels | Servicing compatible contactors used for power switching |
| Preventive Maintenance | Replacing a verified defective internal circuit board |
| Legacy Equipment Refurbishment | Maintaining installed AF contactors using the correct replacement assembly |
The suitability of the 1SFB527068D7085 depends on the installed contactor model, serial number, and internal electronic configuration. It should not be treated as a universal replacement for every ABB AF contactor circuit board.
Installation and Maintenance
- Verify the contactor model: Confirm the exact AF contactor designation and serial number before ordering or installing the PCBA assembly.
- Check the replacement part number: Verify that 1SFB527068D7085 is the correct assembly for the installed contactor configuration.
- Review the serial-number range: Determine whether the contactor falls within the applicable replacement range identified in the assembly instructions.
- Isolate the equipment: Disconnect the relevant power and control supplies, apply lockout/tagout procedures, and verify a safe working condition before opening the contactor.
- Document the existing connections: Record the original connector positions and wiring arrangement before removing the existing circuit board.
- Inspect the contactor housing: Check for contamination, moisture, overheating, mechanical damage, or other conditions that could affect the replacement assembly.
- Examine the existing PCBA: Look for visible damage, burnt components, damaged connectors, or other evidence that may help identify the original fault.
- Check connector alignment: Match the replacement board’s connectors to the designated internal connection points without forcing the connections.
- Use the specified fastening tool: Follow the assembly procedure, including the Torx T25 tool specified for the illustrated fastening operation.
- Apply the specified tightening torque: Where the documented fastening step applies, tighten the screw to 4 Nm as specified in the assembly instructions.
- Perform functional checks: Reassemble the contactor and verify the applicable control operation, contactor response, and auxiliary status indications before returning the equipment to service.
- Record the maintenance work: Document the contactor model, serial number, installed PCBA part number, inspection findings, and test results.
Internal servicing should be carried out by qualified personnel using the applicable ABB instructions. If the contactor does not operate correctly after the board replacement, inspect the wiring and connectors and investigate the coil, control supply, and other relevant contactor components before replacing additional parts.
Compatible System Components
The 1SFB527068D7085 is associated with specific ABB AF contactor configurations. Compatibility should be confirmed against the contactor’s model, serial number, and documented internal assembly.
| Component | Function |
|---|---|
| ABB AF1350 Contactor | Compatible contactor family member identified in the applicable assembly documentation |
| ABB AF1650 Contactor | Compatible contactor family member identified in the applicable assembly documentation |
| ABB AF2050 Contactor | Compatible contactor family member identified in the applicable assembly documentation |
| Applicable AF T-Series Variants | Require confirmation of the exact board and connector configuration |
| Contactor Coil Assembly | Operates the contact mechanism in response to the control circuit |
| Contactor Main Contacts | Switch the connected electrical power circuit |
| Auxiliary Contact Blocks | Provide auxiliary status and interlocking functions where fitted |
| Control Wiring | Connects the contactor to its operating command and control supply |
| Motor Protection Equipment | Provides the applicable protection for the associated motor circuit |
Recommended Related Models
| Model | Product Type | Relevance |
|---|---|---|
| ABB 1SFB527068D7005 | AF Contactor PCBA Assembly | Earlier circuit-board reference |
| ABB 1SFB527068D7015 | AF Contactor PCBA Assembly | Earlier circuit-board reference |
| ABB 1SFB527068D7025 | AF Contactor PCBA Assembly | Related board designation shown in the applicable T-variant assembly documentation |
| ABB AF1350 | AF Contactor | Compatible contactor model identified in the assembly instructions |
| ABB AF1650 | AF Contactor | Compatible contactor model identified in the assembly instructions |
| ABB AF2050 | AF Contactor | Compatible contactor model identified in the assembly instructions |
Key Advantages
- Provides a dedicated replacement option for specified ABB AF contactor electronic assemblies.
- Helps maintenance teams identify the correct board through its complete ordering number.
- Supports servicing of compatible high-current contactor configurations.
- Has documented replacement references for earlier circuit-board versions.
- Allows internal board replacement when supported by the contactor’s assembly instructions.
Technical FAQs
Which ABB AF contactors are associated with the 1SFB527068D7085 PCBA Assembly?
The applicable assembly documentation identifies AF1350, AF1650, and AF2050 contactors, with additional T-variant configurations requiring specific verification. Confirm the full contactor designation and the relevant wiring layout before installing the board.
How does the contactor serial number affect PCBA selection?
The documented replacement arrangement distinguishes contactors with serial numbers up to 1S160100517121223 from those beginning at 1S160100517121224. The later configuration uses 1SFB527068D7085 as a replacement for specified earlier boards. Verify the actual serial number and assembly drawing before ordering.
Can 1SFB527068D7085 replace 1SFB527068D7005 or 1SFB527068D7015?
The assembly documentation identifies 1SFB527068D7085 as the replacement for those earlier PCBA numbers within the specified contactor configurations and serial-number range. Do not assume interchangeability outside that documented scope.
What should be checked if the contactor fails to operate after the PCBA replacement?
Check the connector positions, internal wiring, fastening, control supply, and coil circuit against the applicable assembly instructions. Also verify the contactor’s mechanical condition and any associated control-circuit faults before concluding that the replacement board is defective.