Electric motor 37 kW, 740 rpm, 400 V / 690 V, 4LC-280S-8 LV

For drives that run for long hours and where every percentage of losses is reflected in the energy bill, efficiency and load stability are decisive. The 4LC-280S-8 model with an output of 37 kW is designed for operation in the 700-750 rpm range, so it fits well into applications with constant load and a requirement for long-term economy. As a low-voltage asynchronous electric motor, it helps reduce operating costs without limiting usability in production units, waterworks assemblies, or large technological drives.

Energy saving under continuous load in the 700-750 rpm speed class

This speed class is particularly advantageous where the motor operates steadily and requires predictable running. An energy-saving industrial motor in IE4 class can, thanks to advanced materials, more precise winding, and an optimised air gap, better convert electrical energy into mechanical output. In practice, this means lower losses, less heating, and a more favourable balance in long-term operation.

The IEC 280 mm frame makes integration into robust assemblies easier, where compatibility with existing bases, couplings, and service space is important. It is also important for the operator that the motor combines higher efficiency with a design prepared for intensive use in pumps, fans, compressors, and large machines.

Operating parameters that support stable start-up and load control

During start-up, the motor provides a Tst/Tn ratio of 1.8 and an Ist/In ratio of 7.9, which is important for drives with higher inertia or more frequent starts. The Tmax/Tn ratio of 2 gives the operation a sufficient reserve during short-term resistance increases. The rated current at delta 400 V connection is 71.8 A and at star 690 V is 41.6 A, so the motor can be suitably selected according to the supply method and switchboard requirements.

Rated speed of 740 rpm and rotor inertia of 1.9 kg*m² create a balanced basis for equipment that needs a smooth start and then steady output. The power factor of 0.78 and efficiency of 93.1 % are parameters appreciated by every operation monitoring both the energy balance and the quality of grid loading.

Use in pumps, fans, and heavy technological assemblies

• Pumps benefit from stable torque during continuous fluid transfer in water treatment plants, chemistry, and energy sectors.
• Fans profit from balanced running during long operating periods in HVAC systems and cooling technological units.
• Compressors gain a reliable basis for pressure applications requiring repeatable start-up.
• Conveyor belts and conveyors benefit from consistent speed during material transport.
• Mixers and agitators work with a suitable reserve for changes in the medium viscosity.
• Crushers and mills use a robust design during short-term load peaks.
• Extruders and presses need stable output under technological pressure and a controlled cycle.
• Large machines in the processing industry gain a motor ready for long-term load in low-voltage infrastructure.
• Service and auxiliary drives in energy operations appreciate easier sizing at 400/690 V.

Design ready for servicing and temperature monitoring

The motor is fitted with a DE 6317-C3 bearing and an NDE 6317-C3 bearing, which supports more precise rotor mounting during continuous operation. 3 PTC thermistors are available for monitoring winding temperature, so the operator can respond better to long-term thermal stress. The 2-M63X1.5 cable glands make connection easier in industrial installation conditions.

The noise level of 76 dB(A) corresponds to robust industrial use, and the packing weight of 599 kg together with packing dimensions of 1100*650*850 mm confirm a size category suitable for heavier drives. VYBO Electric, as a trusted brand in the production and distribution of drive systems, builds on premium materials and in-house development, which is why this model is suitable for operations that want to combine reliability, energy savings, and long-term service availability. If you are dealing with a replacement or a new installation, send us a non-binding enquiry and we will prepare a suitable technical recommendation.