Electric motor 45 kW, 740 rpm, 400 V / 690 V, 4LC-280M-8 LV

When selecting a drive for pumps, fans, compressors and heavier machines, it is worth choosing a solution that can handle a stable load, low-voltage infrastructure and long-term operation without unnecessary downtime. The 4LC-280M-8 model with an output of 45 kW falls within the speed class 700-750 rpm and has been designed with an emphasis on advanced materials and sophisticated windings that support smooth operation in both standard and demanding industrial applications.

In practice, this is an IE4 electric motor that helps maintain high efficiency when reliable operation is required in drives for light and heavy industry. Rated speed of 740 rpm, efficiency of 93.4 % and power factor of 0.78 create parameters suitable for technologies where predictable load, smooth start-up and good operational stability are important. The rated current at delta 400 V connection is 87.1 A and at star 690 V connection is 50.49 A, which makes selection easier according to the specific power supply system.

The design with an IEC 280 mm frame, all-cast-iron body and packing weight of 683 kg provides robust support for long-term deployment. 6317-C3 bearings on both the DE and NDE sides support reliable rotor operation with an inertia of 2.2 kg*m², while noise level of 76 dB(A) remains within a practically usable range for industrial environments. The presence of 3 PTC thermistors increase winding protection under thermal stress.

Operation in the 700-750 rpm range for stable low speed

The lower speed class is advantageous where the technology needs a uniform transfer of energy without the need for a high-ratio gearbox. This motor is therefore suitable for continuous processes in which torque, stability and efficient mechanical sizing are important.

Durable design for long service life in demanding environments

The robust cast-iron construction in combination with the IEC frame size of 280 mm helps absorb vibrations and increases resistance to corrosion in aggressive environments. The 2-M63X1.5 cable entries make connection easier in heavy-duty installations, and the overall design supports long-term mechanical stability.

Practical parameters for pumps, fans and large machinery

• Pumps benefit from stable torque during longer operating cycles and when conveying media with a constant flow rate.
• Fans benefit from balanced operation under continuous load and from the low speed class suitable for air-handling units.
• Compressors benefit from a starting torque with a Tst/Tn ratio of 1.8 and a starting current ratio Ist/In of 7.9.
• Large conveyor and process units appreciate the 45 kW output with reliable energy transfer to demanding machinery.
• Mixing equipment uses the breakdown torque with a Tmax/Tn ratio of 2 when overload resistance is required.
• Production lines gain a stable drive foundation for smooth operation without unnecessary outages.
• Industrial pumping stations operate with a design that supports a long bearing and winding service life.
• Exhaust and intake fans benefit from parameters suitable for long-term air circulation.
• Process technologies use predictable operation under variable load and during continuous operation.
• Energy facilities appreciate efficiency of 93.4 % at high output in a low-voltage system.
• Heavy machinery assemblies gain a robust foundation with a packing weight of 683 kg and a durable frame.
• Operations requiring temperature monitoring use 3 PTC thermistors as a practical protective element.
• Assembly units with limited space can use the packing dimensions of 1150*650*850 mm for logistics and handling.

Bearing and mounting reliability during long-term operation

The DE 6317-C3 and NDE 6317-C3 bearings are selected for stable shaft support under the load typical of industrial drives. For this type of machine, the low vibration level also helps, supported by the design of the all-cast-iron housing and suitable rotor seating.

Given the output, speed and robust construction, this is a solution for operations that need a long-term reliable drive with practical maintenance and clear operating reserve. VYBO Electric bases this model on its own research and development, so when selecting it for technologies with requirements for stability, durability and efficient operation, it makes sense to request a quotation.