Magnetek/Century M4098
One Speed, Square Flange 56 Frame Motor
$273.10 - $1,067.45
Horsepower / Efficiency Selection

Magnetek/Century M4098 One Speed, Square Flange 56 Frame Motor Description
These quality Magnetek Century Square Flange Motors are found on many brands of pool pump. Some of these pool pump brands are Sta-Rite, American Products, Pentair, Waterco, Premier Springwater, Waterway, Jandy, Flotec, Red Jacket, Sears Jet, and others.
These motors directly replace the "original" motor that came with your pool pump. No pump manufacturer manufactures their own motors. We sell Century Electric motors because we have found them to be long lasting and reliable. Century Electric Motor is now part of A.O. Smith.
In our chart below, we match "uprated" motors to their "full rated" equivalents. An uprated motor and a full rated motor are often the same motor with two different labels. We have attempted to simplify this with the chart below.
Magnetek Century Square Flange Motor Features:
- Automatic thermal protection,
- Capacitor start.
- Stainless steel threaded shaft.
- Sealed Ball Bearings.
- Maximum Temperature 50 Degrees Celsius ambient.
- Class B Insulated.
- 60 Hertz.
- Full Rate Energy Efficient Models are suitable for use at 50 Hertz (1.0 S.F.).
- 56Y Frame.
- Single phase.
- Single speed (3450 RPM).
- Rotation - CCW at Pump End.
Magnetek Century Square Flange Motor Cross Reference Chart: Stock# may be Replaced by: B2*** or B2***V1
* Stock Number |
Full Rate HP |
Electrical Efficiency |
Volts | Amps | Service Factor |
*REPLACES* Up Rate # |
Up Rate HP |
Up Rate Serv. Fact. |
B846 | 1/2 | Standard | 230/115 | 5.4/10.8 | 1.95 | B852 | 3/4 | 1.25 |
B845 | 1/2 | Energy Efficient |
208-230/115 | 4.4-4.5/8.8 | 1.9 | B862SE | 3/4 | 1.25 |
B847 | 3/4 | Standard | 230/115 | 7.1/14.2 | 1.65 | B853 | 1 | 1.25 |
B2661 | 3/4 | Energy Efficient |
208-230/115 | 6.0-5.6/11.2 | 1.67 | B863SE | 1 | 1.25 |
B848 |
1 | Standard | 230/115 | 8.0/16.0 | 1.65 | B854 | 1.5 | 1.1 |
B841 | 1 | Energy Efficient |
208-230/115 | 7.8-7.4/14.8 | 1.65 | B864SE | 1.5 | 1.1 |
B858 | 1.5 | Standard | 230/115 | 11.2/22.4 | 1.5 | B859 | 2 | 1.1 |
B842 | 1.5 | Energy Efficient |
208-230 | 9.6/8.8 | 1.47 | B865SE | 2 | 1.1 |
B849 | 1.5 | Standard | 230 | 10.0 | 1.5 | B855 | 2 | 1.1 |
B748 | 2 | Standard | 230 | 11.5 | 1.3 | B840 | 2.5 | 1.04 |
B843 | 2 | Energy Efficient |
208-230 | 11.0-10.0 | 1.3 | B866SE | 2.5 | 1.04 |
B844 | 3 | Energy Efficient |
208-230 | 15.0-13.6 | 1.15 | - | - | - |
If you don't find the motor number you are looking for here, please call us. Century Electric also has a motor cross reference on their website.
Nameplate Specifications
Output HP: | See Chart | Output KW: | - |
Frequency: | 60 Hz | Voltage: | 115/230 V |
Current: | See Motor Description | Speed: | 3450 rpm |
Service Factor: | See Chart | Phase: | 1 |
Duty: | Continuous | Insulation Class: | F |
Frame: | Y56Y | Enclosure: | Drip Proof |
Thermal Protection: | Thermally Protected | Ambient Temperature: | 50 °C |
UL: | Recognized | CSA: | Y |
Number of Speeds: | 1 |
Technical Specifications
Electrical Type: | Permanent Split Capacitor, Single Or Dual Voltage | Poles: | 2 |
Rotation: | Counterclockwise Pump End | Mounting: | Square Flange |
Motor Orientation: | Horizontal | Drive End Bearing: | Ball |
Opp Drive End Bearing: | Ball | Frame Material: | Rolled Steel |
Shaft Type: | 1/2 Threaded | Overall Length: | 12.95 in |
Frame Length: | 8.50 in | Shaft Diameter: | 0.625 in |
Shaft Extension: | 0.91 in |
Magnetek Century Electric Square Flange Motor Warranty:
These Motors carry a warranty of 12 months from installation date or 24 months from date of manufacture, whichever comes first.