Issue:External

What does “possible by forcing operation” mean in the TransferPacT catalogue for change-over systems?

Product Line:

TransferPacT Change-over System

Environment:

TransferPacT Change-over  Systems with 2 Sources and 1 Coupler (Bus Tie)

Resolution:

The term “possible by forcing operation” in the Schneider Electric catalogue or instruction sheet indicates configurations that cannot be achieved through standard mechanical interlocking alone. These states require an active command (via PLC or manual intervention) to set the breakers in the desired positions.

Details:

Standard Operational States:

Source 1 Closed, Coupler & Source 2 Open

Source 2 Closed, Coupler & Source 1 Open

Possible by Forcing Operation:

Source 1 Closed, Source 2 and Coupler Open

Source 2 Closed, Source 1 and Coupler Open

Design Considerations:

Ensure load sections are isolated (no shared neutral or common connections).

Confirm TransferPacT controller or PLC logic supports these states and transitions safely.

Configure monitoring and alarms for manual overrides or test modes.

Maintain proper earthing and prevent circulating currents when coupler is open.

Summary:

These “by forcing” states are safe for isolated loads.

They are not included in default automatic logic but can be implemented manually or via PLC.

No special measures are needed beyond verifying control logic and system design.

For more details, refer to TransferPacT Catalogue pages C-25, C-26, and C-27.

Released for: Schneider Electric New Zealand