Electric motor 250 kW, 740 rpm, 400 V / 690 V, 4LC-355L3-8 LV

Model 4LC-355L3-8 with an output of 250 kW delivers stable performance in practice in the speed range of 700-750 rpm, where even energy transfer and long-term reliability are required. This IE4 electric motor is designed with an emphasis on advanced materials, more precise windings and an optimised air gap in order to reduce losses during continuous operation in heavy-duty technologies.

Efficient operation in large industrial drives

For manufacturers of large technological systems, it is important not only to have the rated value, but also stability under load, response during start-up and resistance to long operating cycles. This 8-pole electric motor operates at 740 rpm and, with the correct drive design, provides a suitable basis for applications where both energy balance and the reliability of the entire unit are monitored. Efficiency of 95.4% and a power factor of 0.82 help to keep operation in a technically balanced mode.

For mains connection, it offers a rated current delta 400 V 465 A and a rated current star 690 V 270 A, which allows the motor to be adapted to the specific electrical concept of the plant. The ratio of starting current Ist/In 7.8, the ratio of starting torque Tst/Tn 1.6 and the ratio of breakdown torque Tmax/Tn 2 create parameters suitable for controlled deployment in starting conditions without undesirable overloading of the power supply system.

Construction ready for continuous industrial operation

The motor uses an IEC frame 355 mm, a packing weight of 1900 kg and packing dimensions of 1660*840*1160 mm, which corresponds to a robust solution for installation and handling in a production environment. The 2-M63X1.5 cable glands make connection easier in space demanding installations, and the DE 6322-C3 and NDE 6322-C3 bearings support long-term mechanical stability under higher loads.

• Pumps for process water and process media benefit from stable speeds and consistent torque.
• Fans and blowers use balanced operation during long-term air flow in production units.
• Compressor sets gain a reliable basis for energy-intensive cycles.
• Crushers and mills benefit from robust starting and resistance to shock loading.
• Rolling and forming lines use smooth power transmission in production practice.
• Mixers and mixing units operate with a suitable torque reserve for continuous dosing.
• Extruders and granulation technologies require stable speeds during precise material processing.
• Belt conveyors ensure reliable drive during transport of both bulk and piece materials.
• Pressing machines require consistent operation during repeated working cycles.
• Units for cement plants use the motor’s resistance in dusty and heavily loaded environments.
• Metallurgical lines benefit from operation designed for high demands on continuity.
• Energy and auxiliary technological drives will use the motor where long service life and low losses are required.

Adaptation for integration into large systems

Accessories in the form of 3 PTC thermistors improve winding temperature monitoring and help with protection in demanding operating conditions. Noise level of 89 dB(A) corresponds to the machine’s power class and must be taken into account when designing the placement, enclosure and acoustic separation of the technology. In combination with well-considered control and suitable power supply protection, the solution provides a reliable basis for modern production lines, pump stations and technological blocks with higher demands for continuity.

VYBO Electric builds on many years of the manufacturer’s experience and its own development focused on industrial use, so the motor supports stable operation even in applications where every hour of availability matters. If you are looking for a robust solution for long-term operation in your technology, request a quotation.