SOURCE: 3 speed fan switch
Zing Ear ze208s switches are NOT all the same - the actual switch wafer on the back varies significantly. Some are single-pole making contact with 1, 2, 3 one at a time, others make contact in combinations. Like L123 for high, L1&2 for medium, and L1&3 for low. The number stamped in the center of the back may indicate the difference. I have one with a "4" that is one-pole at a time, and another that is a "21" and makes multiple contacts at a time.
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