What is a Variable Frequency Drive?
A variable frequency drive is an electronic device that allows you to start, stop, and control the speed of a three phase motor. It is also a motor starter as it is equipped with overload protection. Read more »
What is the difference between a 'new surplus' motor and a 'factory new' motor?
Our New Surplus electric motors and drives are new and unused overstock or discontinued items offered at lower prices and come with our 90-day warranty.

Factory New products are competitively priced and come with a manufacturers warranty.
Variable frequency drives (VFDs or inverters) now play an important part in major industry.
Within the last 10 years they have been perfected to control and vary the speed of 3 phase electric motors. They serve many purposes, besides speed control. Homeowners and hobbyist alike, who have lathes or milling machines with a 3 phase motor, usually don't have 3 phase power to operate. These VFDs (instead of using a rotary phase converter) can now be used to convert single phase power to 3 phase power. Read more »
 
 
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Since 1913, Marathon Electric has been dedicated to providing customers with quality products for targeted applications. Located in Wausau, Wisconsin, the company delivers efficient mechanical power solutions using AC electric motors up to 1250 HP.
 

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Dealers Electric-Marathon    447TSTDN16008
350 HP, 3600 RPM, 460 Volts, DP, 447TS, Rigid, Marathon, U791
$21,070.39
Out of Stock
Dealers Electric-Marathon    449TSHFS9001
350 HP, 3600 RPM, 460 Volts, TEFC, 447/449TS, Rigid, Marathon, W634
$45,984.90
Out of Stock
Dealers Electric-Marathon    449TSTFS6001
350 HP, 3600 RPM, 460 Volts, TEFC, 447/449TS, Rigid, Marathon, E273
$49,868.83
Out of Stock
Dealers Electric-Marathon    449TSTFS6501
350 HP, 3600 RPM, 460 Volts, TEFC, 447/449TS, Rigid, Marathon, E769
$50,197.94
Out of Stock
Dealers Electric-Marathon    449TTFS16334
400 HP, 1800 RPM, 460 Volts, TEFC, 447/449T, Rigid, Marathon, E291
$41,491.33
Out of Stock
Dealers Electric-Marathon    449TTFS16553
400 HP, 1800 RPM, 460 Volts, TEFC, 447/449T, Rigid, Marathon, E776
$40,571.08
Out of Stock
Dealers Electric-Marathon    449TSTDN16003
400 HP, 3600 RPM, 460 Volts, DP, 449TS, Rigid, Marathon, U793
$36,982.12
Out of Stock
Dealers Electric-Marathon    449TTFS6065
450 HP, 1800 RPM, 460 Volts, TEFC, 447/449T, Rigid, Marathon, E292
$42,539.48
Out of Stock
Dealers Electric-Marathon    449TSTDN16004
450 HP, 3600 RPM, 460 Volts, DP, 449TS, Rigid, Marathon, U795
$46,744.47
Out of Stock
Dealers Electric-Marathon    5011LSTFS16031
500 HP, 1800 RPM, 460 Volts, TEFC, 5011LS, Rigid, Marathon, E364
$79,661.60
Out of Stock
Dealers Electric-Marathon    449TSTDN16005
500 HP, 3600 RPM, 460 Volts, DP, 449TS, Rigid, Marathon, U797
$46,871.13
Out of Stock
Dealers Electric-Marathon    5011LSTFS16033
600 HP, 1800 RPM, 460 Volts, TEFC, 5011LS, Rigid, Marathon, E366
$94,386.86
Out of Stock

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