Part #wd-7100-64, Washer Unbalance Switch / 2.50 x 1.20 x 0.80. This unbalance switch (part number WD-7100-64) is for washers. Unbalance switch WD-7100-64 detects an unbalanced load and stops the washer. Unplug the washer and shut off the washer supply before installing this part. Wear work gloves to protect your... - Part #wd-7100-64, Washer Unbalance Switch / 2.50 x 1.20 x 0.80.