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For one of the most demanded ratings in your small and medium machines, the 4 kW electric motor price and sales, you are in the right place. At HEM Motor we offer 4 kW (about 5.5 HP) three-phase asynchronous motors mostly in a 112 frame size; in 2-pole (3000 rpm), 4-pole (1500 rpm) and 6-pole (1000 rpm) options, with B3 foot, B5 and B14 flange mountings, in IE3 and IE4 efficiency classes, from stock. On this page we explain pole-speed selection, mounting types, efficiency classes and the fast quotation process in plain language.
4 kW is one of the most demanded small-power steps, with a wide range of use from workshops to production lines. Small pumps, fans, compressors, conveyors, woodworking and packaging machines cluster around this rating. That is why stock depth and correct pole and mounting selection in a 4 kW motor are the key to completing your order quickly. To learn stock status and the most suitable configuration for you, reach us through the HEM Motor electric motor prices page and get a fast quotation by sharing your requirement.
Even at a common rating like 4 kW, two motors with the same label can differ. Pole count, efficiency class, mounting type and winding quality determine both the price and the motor's fit to your machine. Working with the advantage of ready-stock sales from the manufacturer lets you select the exact configuration you need with a clear price-performance logic and quickly.
Pole and Speed in a 4 kW Motor: 2, 4 and 6 Poles
The most critical choice in a 4 kW motor is the pole count, which determines the speed. A 2-pole 4 kW motor offers high speed at 3000 rpm and is used in small centrifugal pumps and high-speed fans. A 4-pole 4 kW motor at 1500 rpm is the most common choice and the standard in conveyors, mixers and general drives. A 6-pole 4 kW motor at 1000 rpm serves applications needing low speed and high torque.
| Pole / Speed | Typical Application | Key Feature |
|---|---|---|
| 2-pole (3000 rpm) | Small centrifugal pump, high-speed fan | High speed, compact frame |
| 4-pole (1500 rpm) | Conveyor, mixer, general drive | Balanced torque, most common choice |
| 6-pole (1000 rpm) | Low-speed process, special drive | High torque, quiet running |
If you are unsure which speed suits your machine, simply share the speed value on your existing motor's nameplate. You can find details in our 4 kW electric motor selection: 2/4/6 pole guide, and for popular small-power combinations, review our 1.5 and 2.2 kW motor selection article.
Mounting Type: B3 Foot, B5 and B14 Flange
A 4 kW motor sitting correctly on your machine depends on choosing the right mounting type. In the small-power band the B14 flange is especially important, because it is widely used in pumps, reducers and compact machines. The foot-mounted B3 frame covers classic floor mounting, while the B5 flange covers larger flange connections.
- B3 foot mounting: Fixed mounting to floor or base; ideal for conveyors and general drives.
- B5 flange mounting: Large flange connection keeping the shaft perfectly aligned.
- B14 face flange: Compact mounting solution for small machines, pumps and reducers.
To see the differences between connection types, review our B5 flange electric motors and B3 mounted electric motors pages. If you are replacing your existing motor, sharing the foot-hole spacing, shaft diameter and flange size is enough for a correct replacement.
IE3 and IE4 Efficiency Class: The Right Choice at 4 kW
In the 4 kW band the efficiency class keeps its importance despite being a small power. By regulation, IE3 is the minimum standard; in machines running all day, the IE4 super premium efficiency class noticeably reduces the energy bill. As HEM Motor, we offer both our IE3 electric motors and IE4 electric motors from stock.
- IE3 premium efficiency: A balanced price-performance point for medium-intensity workshops and machines.
- IE4 super premium efficiency: Lowers total cost of ownership in lines running long hours.
- Copper winding, F insulation: Even at small power, winding quality determines motor life and endurance.
To see the efficiency class impact on the investment decision, we recommend our 2.2, 3 and 4 kW IE3 motor stock guide and the general electric motors category.
Where the 4 kW Motor Is Most Used
4 kW is the standard drive power of many machines from the workshop to the factory. Selecting the right motor requires accounting not only for power but also for the application's duty type and ambient conditions.
| Sector / Application | Typical Drive | Priority Feature |
|---|---|---|
| Water and booster | Small centrifugal pump, booster set | Efficiency in continuous running |
| Woodworking | Planer, saw, milling machine | Robust bearings, vibration-free |
| Packaging | Conveyor, filling line | Smooth speed, quiet running |
| HVAC and ventilation | Small fan and exhaust | Low vibration, balanced running |
To see options for your application, review our woodworking machinery motors, packaging machinery motors and pump electric motors pages.
Starting and Electrical Connection of a 4 kW Motor
At a small power like 4 kW, most applications run comfortably with direct-on-line (DOL) starting, because the inrush current does not seriously strain the grid at this rating. That said, in machines that start and stop frequently or need precise speed control, driving with a variable frequency drive (VFD) provides both energy saving and a soft start. A 4 kW three-phase motor can be connected in star or delta on a 230/400 V grid depending on the terminal bridging; the correct connection is chosen according to the motor's rated voltage and your grid.
- Direct-on-line (DOL) starting: The most common and economical method at small powers like 4 kW.
- VFD drive: Ideal for machines needing speed control, soft start and energy saving.
- Star/delta terminal bridging: Critical for correct voltage selection on a 230/400 V grid.
To select the correct cable cross-section, fuse and contactor, you need to know the motor's rated current. On this topic we recommend our motor protection, thermal and fuse selection article and our 2.2/3/4 kW asynchronous motor selection guide.
Ready-Stock Sales and Fast Quotation Process
Our biggest advantage in 4 kW motors is wide ready-stock sales flexibility. We take care to keep the most demanded 2-, 4- and 6-pole configurations available with B3/B5/B14 mounting options. You can view standard-frame motor options on our standard electric motors page.
To define your need, three pieces of information are enough: power (4 kW), speed/pole and mounting type (B3, B5 or B14). With these three headings we offer you the most accurate price-performance recommendation and a fast quotation. Simply contact us for current electric motor prices and stock status.
Frequently Asked Questions
What determines the 4 kW electric motor price?
Pole count (speed), efficiency class (IE3/IE4), mounting type (B3/B5/B14) and requested options are the main factors. In ready-stock sales, with no intermediary cost, the price-performance balance is often more favourable.
How many HP is 4 kW?
4 kW corresponds to about 5.5 HP. If your existing machine is labelled in HP, we clarify the kW equivalent together and select the right motor.
What is the B14 flange used for in a 4 kW motor?
The B14 face flange provides a compact, precise connection in small machines, pumps and reducers. Sharing your machine's flange size is enough for the right choice.
Which frame size is used for a 4 kW motor?
4 kW motors are typically built in a 112 frame size; the frame detail may change with speed and efficiency class. For a correct replacement, the existing motor's nameplate data is enough.
How quickly can I get a 4 kW motor from stock?
We try to keep the most demanded 2-, 4- and 6-pole configurations under a ready-stock approach. If the configuration is in stock, delivery is fast; special cases are clarified during the fast quotation stage.
To source the right 4 kW motor for your machine at the best price-performance from stock, contact the HEM Motor team; send us your requirement and let us prepare a tailored fast quotation.