This works for me...
Code:
Sub BreakEquations()
Dim aField As Field
For Each aField In ActiveDocument.Fields
If aField.Type = wdFieldEmbed Then
If InStr(1, aField, "Equation.3") Then aField.Unlink
End If
Next aField
End Sub
Credit: I found this post by Siddharth Rout which contained the clue
excel - How to find equation editor in word document using VBA? - Stack Overflow