Electric motor 45 kW, 990 rpm, 400 V / 690 V, 4LC-280S-6 LV

Solutions with IE2 or IE3 class usually bring higher operating losses, so the 4LC-280S-6 motor with an output of 45 kW is a suitable choice where long-term energy savings are worthwhile. In the speed range of 900-1000 rpm, this three-phase motor is particularly suitable for applications where stable torque, precise loading and lower thermal stress during continuous operation are decisive. Thanks to an efficiency of 94.8%, it can reduce energy losses by approximately 15% to 20% compared with IE3, which is noticeable in the total costs during continuous running.

The design with a frame size of 280 mm is built on a robust cast iron housing, which supports the rigidity of the assembly and helps to handle vibrations when connected to pumps, fans and compressors. At the same time, resistance to corrosion is improved, which is important in production units with a dusty, humid or chemically demanding environment. The rated current at the delta connection 400 V is 80.6 A and at the Y connection 690 V is 46.7 A, while the power factor of 0.83 supports economical operation with a properly designed drive.

Energy-saving performance for operation in the range of 900-1000 rpm

At this speed class, it is crucial that the motor can handle long-term load without unnecessary fluctuations. The starting ratio Tst/Tn 2 and breakdown ratio Tmax/Tn 2 suit applications where smooth starting and stable operation in steady-state mode are required. The starting current Ist/In 8.5 must be taken into account when sizing the supply network and protection elements, especially in production operations with limited power reserve.

Operational reliability in production and technological lines

The motor is equipped with bearing DE 6317-C3 and bearing NDE 6317-C3, which supports reliable operation under load and over longer operating cycles. The rotor inertia of 2.0 kg*m² helps with starting dynamics and when linked to technologies with a steady demand. Noise level of 78 dB(A) remains within the range that is common for heavier industrial applications, while the PTC winding protection increases safety under thermal stress.

Use in drives with higher torque demand

The 4LC-280S-6 model will prove itself in operations where a combination of higher output, reliable starting and energy-efficient operation is required. Typically, this includes higher-output pumps, continuously operating fans, compressor assemblies, conveyor technologies, crushers, mixers, milling and machining centres, extruders, mixing lines, presses and other equipment with low-voltage infrastructure. The 2-M63X1.5 cable glands facilitate connection in industrial switchboards, and the package weight of 489 kg and dimensions of 1102*652*846 mm must be taken into account during handling and installation planning.

Technical parameters that make drive design easier

• Output of 45 kW provides sufficient reserve for demanding continuous loads.
• Rated speed of 990 rpm supports use in applications with lower speed and higher torque.
• Efficiency of 94.8% reduces energy demand during long-term operation.
• Power factor of 0.83 helps with correct power supply and compensation design.
• PTC winding protection increases motor protection under thermal load.

Example applications in industrial operation

• Pumps operate reliably when transporting liquids steadily in continuous mode.
• Fans use a balanced ratio of output and speed in air handling and extraction.
• Compressors benefit from stable starting and adequate torque reserve.
• Conveyors ensure smooth material movement in production lines.
• Mixers and agitators handle long cycles with changing loads.
• Crushers and grinding machines use high output under impact load.
• Extruders require precise and consistent operation under continuous stress.
• Presses operate with sufficient force reserve during repeated working cycles.
• Machining centres require a stable drive with minimal losses.
• Textile and processing lines appreciate reliability during long shifts.
• Energy technologies benefit from high efficiency and predictable operation.

If you are looking for a motor for long-term deployment in demanding operation, the 4LC-280S-6 with a speed of 990 rpm offers a combination of output, efficiency and design reliability. VYBO Electric is based on its own research and development, so we can also help you with a technical assessment of suitability for pumps, fans, compressors or other machines. Check the suitability of the motor for your application.