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Motor Winding Heater Controls

Even the best motor winding insulation materials become water permeable with repeated exposure to temperature extremes and moisture. If the ambient temperature is below the "dew point" when a motor is turned off, condensation will form inside the motor as it cools down. When the motor is re-energized, the moisture heats up and permeates the windings, eventually shorting and damaging the motor. Airborne corrosive elements like salt and chemicals can also combine with condensation and erode the rotor and bearings, leading to premature motor failure.

The MWH Series provides a cost effective solution to these problems by preventing condensation build-up in motors. By applying a low level current to the motor windings during extended shut down periods, the MWH Series keeps AC motors warm and moisture-free.

Motortronics MWH Series Winding Heater Controls Distributors
MWH Series

If you are looking for Motortronics Motor Winding Heater, please call us at (800) 894-0412 or email us at we will do our best to help you find the Motortronics MWH Series Controls that you are looking for at the most competitive prices possible. If you are searching for Phasetronics MWH Series technical information (data-sheets) please use the datasheets or product selection guide page links.

Designed for fully automatic operation, the MWH Series turns on when the motor starter has turned off. A built-in one minute timer ensures that the motor magnetic field has collapsed before it injects DC power into the windings. When the motor is restarted, the MWH Series instantly turns off. No operator interface is required, the MWH Series is in control.

The MWH Series had an optional shutdown input that can be connected to the N.O. auxiliary contact on the motor starter's thermal overload relay. This will disable the motor winding heater control, preventing any additional heating in the motor and allowing for a faster motor cool down period. The MWH Series then goes back on-line after the overload relay is reset.

Eliminate the cost and hassle of installing strip heaters into your motors. Simply wire up the MWH Series to generate heat throughout the motor stator windings. The heat is dissipated evenly without the "hot spots" caused by strip heaters. Conduction of heat to the rotor, bearings and shaft is also more effective which means maximized protection for the whole motor.

Whether retrofitting an existing starter or installing a new one, the MWH Series is easy to apply. Just wire it in parallel to the magnetic starter's line and load connection, connect the necessary auxiliary contacts and installation is complete.

Output voltage is factory set to maintaina +5° to 10°C differential above ambient temperature. This adjustment can be used to trim the control as required for each application.

In addition to built-in fuse protection, the MWH Series features an RC snubber circuit across the SCR which protects it from any rapid rate of change in the system voltage. A metal oxide varistor (MOV) protects the unit against voltage spikes for reliable, maintenance-free operation.

Model Number Max Amp Rating Motor Horsepower/Voltage Dimensions
Panel Mount NEMA 1
208V 240V 480V 575V H W D H W D
MWH - 10 10 3 - 40 5 - 50 10 - 100 15 - 125 6.2 4.5 6 1.1 7 7
MWH - 25 25 50 - 100 60 - 125 125 - 250 150 - 300 8 6 6 1.1 7 7
MWH - 50 50 125 - 200 150 - 250 300 - 500 350 - 600 10 8 7.9 1.5 10 8
MWH - 80 80 250 - 300 300 - 400 600 - 800 700 - 900 10 8 9.3 20 10 10

Whether we have Motortronics overloads in stock in Boise, Idaho or need to ship direct from Motortronics to any USA cities; Clearwater Tech can get Motortronics MWH-10 heater to you fast and save you some money. Our industrial factory automation supplies distributors warehouse stocks some Motortronics products enabling us to further assist you in finding the correct Motortronics MWH-25 heater in the USA, Canada, or Mexico. It will be very helpful if you have the MWH-50 heater part numbers ready, then our sales representatives can provide you with a pricing and availability quote for Motortronics MWH-80 heater that you are looking for in seconds. If you do not have the part numbers for Phasetronics motor winding heater controls, our application engineers will be able to help you figure out the part numbers and get the price quote to you as soon as possible.

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