Here’s a useful, practical write-up about — what they are, why they matter, common configurations, and how to interpret them safely.
THERMAL FUSE | (L) HOT ----------| |--------- (L) Terminal on Switch (Black Wire) (Usually Black or Red wire) | | +---------------+---------------+ | | | (Position 1) (Position 2) (Position 3) "Low Speed" "Med Speed" "High Speed" | | | 1.2K ohm 600 ohm 0 ohm Tap Tap Tap | | | +-------+-------+---------------+ | [Motor Main Winding] | | (N) Neutral Terminal | (N) Neutral ---------------+----------------- Wall Plug White Wire Lasko Fan Wiring Diagram