ABB 1SFB527068D7005 PCBA Circuit Board for AF1350 AF1650 AF2050 Contactors

ABB 1SFB527068D7005 is a PCBA circuit board assembly associated with ABB AF series high-current
contactors. ABB technical documentation identifies this part number in connection with AF1350,
AF1650 and AF2050 contactor configurations. The board forms part of the contactor control
arrangement and is connected to the A1 and A2 control terminals.

The component is designed as an internal electronic assembly rather than as a complete contactor.
Its role is related to the electrical control and operating circuit of the associated contactor.
When the contactor receives its specified control signal, the internal control electronics manage
the operating sequence of the contactor according to the design of the corresponding AF series
equipment.

Correct identification is particularly important for this part because ABB has introduced a later
PCBA replacement. ABB documentation states that PCBA assemblies 1SFB527068D7005 and
1SFB527068D7015 are replaced by 1SFB527068D7085 for applicable contactors from specified serial
numbers. The installed contactor serial number should therefore be checked before selecting a
replacement board.

Product Identification

Function of the PCBA

A large contactor requires an internal control arrangement to convert the external control command
into the appropriate operating action of the contactor. The PCBA provides part of this internal
electrical control architecture.

The 1SFB527068D7005 board is associated with the control terminals A1 and A2 shown in ABB
installation documentation. These terminals form the control-side interface of the contactor.
The exact control voltage and control circuit arrangement depend on the complete contactor
configuration and should be verified from the contactor nameplate and applicable documentation.

Because the PCBA is an internal control component, it should not be treated as a general-purpose
PLC board or variable-frequency-drive control board. Its function is specifically associated with
the compatible ABB AF contactor assembly.

Compatible ABB AF Contactor Families

ABB documentation associates 1SFB527068D7005 with the large AF contactor family, including
AF1350, AF1650 and AF2050 variants. These contactors are designed for high-current switching
applications and use an electronic control arrangement to operate the main contactor mechanism.

The T-designated versions require particular attention during replacement because ABB documentation
shows additional differences in the PCBA arrangement. The complete contactor designation and serial
number should be used when determining the correct board configuration.

PCBA Replacement Information

One of the most important identification points for ABB 1SFB527068D7005 is its replacement status.
ABB service documentation explicitly states that PCBA part numbers 1SFB527068D7005 and
1SFB527068D7015 are replaced by 1SFB527068D7085.

For the AF1350, AF1650 and AF2050 contactor documentation, ABB specifies that this replacement
applies to contactors from serial number S160100517121224. The documentation also shows that
earlier contactors, up to serial number S160100517121223, use the earlier PCBA assembly arrangement.

A1 and A2 Control Connections

ABB installation documentation shows A1 and A2 as the control connections associated with the
contactor’s electronic control arrangement. These connections provide the interface between the
external control circuit and the internal contactor control electronics.

When servicing the PCBA, the A1 and A2 wiring should be documented before disassembly. The correct
connection arrangement must be restored during installation. Control voltage must be verified
against the complete contactor configuration rather than inferred solely from the PCBA part number.

Incorrect control wiring can prevent normal contactor operation or cause damage to the control
electronics. Electrical isolation and the applicable ABB service instructions should therefore be
followed before opening the contactor assembly.

Mechanical Installation

The PCBA is installed inside the associated AF contactor assembly. ABB service documentation
illustrates removal of the contactor front cover and access to the PCBA area during replacement.

The documented service procedure uses a Torx T25 tool for the relevant fastening points, with a
specified tightening torque of 4 Nm for the illustrated screws. The actual service procedure should
be followed according to the exact contactor model and applicable ABB documentation.

During installation, the board should be positioned correctly within the contactor enclosure and
the electrical connections should be routed as shown in the service documentation. Mechanical
interference with the contactor operating mechanism must be avoided.

Maintenance and Troubleshooting

A failure in the internal control board can result in abnormal contactor behavior. Possible
symptoms may include failure to operate when the control command is applied, unexpected control
behavior or an interruption in the contactor operating sequence.

Troubleshooting should begin with the complete control circuit rather than immediately replacing
the PCBA. The control voltage at the A1 and A2 terminals, external wiring, connectors, mechanical
condition of the contactor and internal control components should all be considered.

If the external control circuit is confirmed to be correct but the contactor still fails to operate,
the internal electronic assembly can then be investigated according to ABB service procedures.

• Verify the contactor model and complete type designation.
• Check the contactor serial number.
• Verify the control circuit and A1/A2 connections.
• Inspect connectors and internal wiring.
• Check the mechanical condition of the contactor.
• Compare the installed PCBA part number with ABB replacement documentation.
• Verify whether 1SFB527068D7085 is the applicable replacement.

Part Number Identification

The complete identification of this component is ABB 1SFB527068D7005. The part number should be
recorded exactly because several similar PCBA references exist within the same AF contactor family.

The related part number 1SFB527068D7015 is also identified in ABB documentation as an earlier PCBA
that is replaced by 1SFB527068D7085 under the applicable replacement conditions. This makes the
serial-number check especially important when working with older AF contactors.

Application in High-Current Switching Systems

AF1350, AF1650 and AF2050 contactors are intended for high-current industrial switching duties.
Their applications can include motor control, power distribution and other industrial electrical
systems where large electrical loads must be switched by a contactor.

The 1SFB527068D7005 PCBA does not perform the main power switching function itself. Instead, it
belongs to the contactor’s electronic control arrangement. The main current path remains associated
with the contactor’s primary power terminals, while the PCBA handles the relevant control-side
functions.

Technical Considerations for Replacement

When replacing 1SFB527068D7005, several identification points should be confirmed before the new
assembly is installed. The contactor model, serial number, PCBA reference, control arrangement and
mechanical mounting configuration should all correspond to the intended service application.

Particular attention should be given to the ABB documented transition from 1SFB527068D7005 to
1SFB527068D7085. A replacement part should not be selected solely because it appears physically
similar. The serial-number range determines which PCBA configuration is applicable.

Technical Summary

Technical Note

Conclusion

ABB 1SFB527068D7005 is a PCBA circuit board assembly used in the control arrangement of large ABB
AF series contactors. It is associated with AF1350, AF1650 and AF2050 contactors and interfaces
with the A1 and A2 control connections.

The most important consideration when identifying this part is its documented replacement history.
ABB has specified 1SFB527068D7085 as the replacement for 1SFB527068D7005 and 1SFB527068D7015 under
the applicable serial-number conditions. For maintenance and spare-part selection, the complete
contactor model and serial number should therefore be checked together with the PCBA part number.