Three-phase electric motor: 3LC-280S-4, 75 kW
| Basic technical data | |
| Motor type | 3LC-280S-4 |
| Rated power (kW) | 75 |
| Frame size (mm) | 280 |
| Number of poles | 4 |
| Rated speed (rpm) | 1485 |
| Frequency (Hz) | 50 |
| Electrical parameters | |
| Rated voltage (V) | 400/690 |
| Connection | △/Y |
| Rated current 400 V (A) | 129 |
| Rated current 690 V (A) | 74,78 |
| Efficiency at 100% load (%) | 95 |
| Efficiency class | IE3 |
| Power factor at 100% load | 0,88 |
| Starting and torque characteristics | |
| Locked-rotor torque ratio (LRT/RLT) | 2 |
| Breakdown torque ratio (BDT/RLT) | 2,3 |
| Locked-rotor current ratio (LRA/RLA) | 6,9 |
| Rotor moment of inertia (kg·m²) | 2,1199 |
| Applicable standards | |
| Specification | IEC60034-1 |
| Testing | IEC60034-2 |
| Noise | IEC60034-9 |
| Vibration | IEC60034-14 |
| Construction and operating data | |
| Mounting arrangement | IM B3, B5, B35, V1 |
| Duty type | S1 (S2, S3, S4 – S9 optional) |
| Load type | Parabolic or linear curve |
| Degree of protection | IP55 |
| Insulation class | F |
| Temperature rise class | B |
| Cooling method | IC411 |
| Starting method | DOL, VFD, soft starter |
| Direction of rotation | Both |
| Vibration (mm/s) | 2.8 |
| Cable glands | 2-M63X1.5 |
| Operating conditions | |
| Ambient temperature range | -20 to +40°C (-30, +50, +60 optionally) |
| Maximum installation altitude | up to 1000m |
| Packaging and dimensions | |
| Packaging dimensions (mm) | 1102*652*846 |
| Package weight (kg) | 570 |
| Bearings and lubrication | |
| DE/NDE bearings | 6317-C3/6317-C3 |
| Lubricant | Lithium-based grease No. 2 (temperature class) |
| Accessories | |
| 3 x PTC thermistor | |
When designing a drive, stability, spare-part availability and long-term operating economy are decisive. This 1500 rpm electric motor in the 3LC PRO design delivers an ideal balance between purchase price and energy savings, while the 3LC-280S-4 model is suitable wherever the drive needs reserve for both starting and continuous load.
A robust cast-iron frame helps keep the motor precisely positioned even during continuous operation, vibration and frequent starts. Reinforced cast-iron bearing shields together with reinforced cast-iron feet improve mounting rigidity and support longer service life in machines operating in multi-shift service.
IE3 efficiency class reduces energy losses under normal load and makes sense for lines that run for long hours every day. In practice, you will particularly appreciate this where the difference between short-term savings on purchase price and the real impact on electricity costs over the machine’s entire service life matters.
A power output of 75 kW, rated speed of 1485 rpm and a 400/690 V supply provide a suitable basis for a three-phase electric motor in applications requiring smooth operation and reliable starting. A 400 V electric motor in this design fits into standard industrial power systems without unnecessary installation modifications.
1500 rpm electric motor for stable operation of production technologies
In light and medium industry, this three-phase electric motor performs particularly well where the load changes during a shift and resistance to long-term thermal stress is important. The design supports consistent performance in drives that must not fluctuate unnecessarily.
- Air-handling units with higher resistance in the duct network.
- Centrifugal pumps in process-water treatment plants.
- Screw conveyors for bulk materials.
- Belt conveyors in packaging and sorting lines.
- Agitators in chemical dosing systems.
- Compressor units for internal compressed-air distribution.
- Fan assemblies for extraction in production halls.
- Briquetting presses for waste processing.
- Granulation lines in plastics processing.
Robust cast-iron frame for machines with higher rigidity requirements
OEM manufacturers particularly appreciate how the cast-iron design helps maintain geometric mounting precision even under dynamic stress. In smaller technological units, this reduces the risk of unwanted vibration that could otherwise shorten bearing life and increase service intervention.
For installation technicians, the 2-M63X1.5 cable glands are another important detail, simplifying connection design to the switchgear or machine. The DE bearing 6317-C3 and NDE bearing 6317-C3 are selected for stable mounting in applications where reliability is not open to compromise.
IE3 efficiency that helps reduce operating costs
In serial machines, every percentage point of loss translates into long-term costs. IE3 efficiency class therefore makes sense in equipment operating in steady cycles, conveyors, fans and pumps where energy savings accumulate over thousands of operating hours.
A noise level of 80 dB(A) is a value that can be taken into account when designing technical rooms and machine assemblies. Rotor inertia of 2.120 kg/m² helps when designing acceleration and deceleration modes, which is useful for engineers sizing drives with more frequent starting.
Proven for series production and service replacements
The 3LC-280S-4 model is based on production discipline that is also confirmed in practice by ISO certificates. For service teams, the packaged weight of 570 kg and package dimensions of 1102*652*846 mm are important because they simplify planning for handling, storage and replacement within the plant.
If you need a drive for a production line, technological system or OEM assembly, 3LC PRO offers a sensible power reserve, long bearing service life and lower consumption in everyday operation. Take advantage of the offer and choose a motor that supports reliable equipment operation without unnecessary downtime.