Electric motor 37 kW, 990 rpm, 400 V / 690 V, 4LC-250M-6 LV

Model 4LC-250M-6 37 kW is intended for operations that require reliable torque in the speed range of 900-1000 rpm and, at the same time, a sensible energy balance in long-term use. In practice, it performs well in pumps, fans, compressors, and also in production units where low-voltage infrastructure requires stable operation without unnecessary fluctuations. The design with a frame size of 250 mm uses solutions that support precise running and load resistance.

Operation in the 900-1000 rpm range for technologies with constant load

This speed class is suitable where even power transmission and good process control are required. The rated speed of 990 rpm provides scope for applications with higher inertia, where smooth starting and stability during engagement are important. A starting torque ratio Tst/Tn of 2 and a breakdown torque ratio Tmax/Tn of 2.1 allow common load peaks to be handled without losing operating confidence.

IE4 efficiency reduces losses during long daily use

The motor operates with an efficiency of 94.5% and a power factor of 0.83, which brings better use of electrical energy in applications with frequent or continuous operation. In segments where energy costs and thermal load are monitored, such an IE4 electric motor has practical significance, especially during long operating cycles. Advanced materials, sophisticated windings, and precisely controlled air gaps form the basis for consistent performance and lower operating losses.

Construction prepared for industrial load

The rated current with the delta 400 V connection reaches 67.3 A and with the star 690 V connection 39 A, so the motor can be adapted to the specific supply network and starting method. The starting current ratio Ist/In of 8.3 is important when designing protection and switching components, especially in operations with sensitive power supply and repeated starts. The rotor inertia of 1.0 kg*m² helps with estimating the dynamics of the entire drive.

Parameters that make drive design easier

• The rated current delta 400 V is 67.3 A and the rated current star 690 V is 39 A, which helps with selecting the connection according to the voltage level.
• The starting current ratio Ist/In 8.3 supports precise sizing of protection and switching equipment in the control panel.
• The DE bearing 6314-C3 and the NDE bearing 6314-C3 contribute to reliable mechanical support for the rotor.
• The accessories include 3 PTC thermistors, which increase winding protection against thermal overload.
• The noise level of 78 dB(A) is suitable for industrial spaces where acoustic load is also monitored.
• The cable glands 2-M63X1.5 make it easier to bring in power cables during installation.

Use in pump, fan, and compressor drives

• Pumps benefit from stable torque when conveying liquids in filtration, cooling, and process circuits.
• Fans gain from smooth operation during air flow in extraction and HVAC systems.
• Compressors gain a reliable basis for pressure applications with repeated loading.
• Large machines in production lines use the robust design during both shock and long-term cycles.
• Drives for light and heavy industry appreciate the balance of efficiency, current, and mechanical durability.
• Operations with low-voltage infrastructure benefit when planning the power supply and protective elements.

Mechanical durability and installation data for service teams

The package weight of 397 kg and package dimensions of 1012*582*781 mm are important for logistics, storage, and handling during installation. The motor is equipped with 6314-C3 bearings on both sides, which supports long service life with properly designed maintenance. The 2-M63X1.5 cable glands offer a practical solution for safe connection, and the 3 PTC thermistors simplify the integration of protection into the control system. Thanks to these parameters, the solution is suitable for operations that require predictable maintenance and high operational availability.

If you need a motor for a demanding industrial drive with an emphasis on efficiency, stability, and long-term reliability, the 4LC-250M-6 37 kW model is ready for deployment in modern operations. For specific technical documentation and availability for your project, please request a quotation.