A transfer switch is an electrical switch that switches a load between two sources. Some transfer switches are manual, in that an operator effects the transfer by throwing a switch, while others are automatic and trigger when they sense one of the sources has lost or gained power.
WESTINGHOUSE DMERGENCY LED LAMP 2.4W
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WESTINGHOUSE STABDING FAN 16" 440W WHITE
Industrial Ceiling Fan - Rebel III White
WESTINGHOUSE 15W / T2FS / 6500K