minScale

Labels will only be visible when the viewing scale is larger than (or equal to) the minScale. For example, if the viewing scale is 1:12000 and the LabelingInfo.minScale is 1:20000, then the labels will be visible (because 1/12000 >= 1/20000).

A LabelingInfo.minScale of 0, which is the default, indicates no lower limit on the viewing scale.