Three-phase electric motor: H27R-3551-4 355KW 6000V 50HZ
| Basic technical data | |
| Motor type | H27R 3551-4 |
| Rated power (kW) | 355 |
| Frame size (mm) | 355 |
| Number of poles | 4 |
| Rated speed (rpm) | 1487 |
| Frequency (Hz) | 50 |
| Electrical parameters | |
| Rated voltage (V) | 6000 |
| Connection | Y |
| Rated current (A) | 40,6 |
| Efficiency at 100% load (%) | 94,9 |
| Power factor at 100% load | 0,89 |
| Starting and torque characteristics | |
| Rated torque (Nm) | 2280 |
| Locked-rotor torque ratio (LRT/RLT) | 0,85 |
| Breakdown torque ratio (BDT/RLT) | 2,2 |
| Locked-rotor current ratio (LRA/RLA) | 5,7 |
| Rotor moment of inertia (kg·m²) | 7 |
| Load moment of inertia (kg·m²) | 205 |
| Accessories | |
| 6 x PT100 in windings | |
| 1 x PT100 in NDE bearing | |
| 1 x PT100 in DE bearing | |
| Anti-condensation heater 230 V | |
| 3 x PTC thermistor | |
| Applicable standards | |
| Specification | IEC60034-1 |
| Testing | IEC60034-2 |
| Noise | IEC60034-9 |
| Vibration | IEC60034-14 |
| Construction and operating data | |
| Mounting arrangement | IM B3 (other designs on request) |
| 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 | IC611 (On request IC616, IC666) |
| Starting method | DOL, VFD, Soft-starter |
| Direction of rotation | Both |
| Vibration (mm/s) | 2.8 |
| Rotor cage | copper rotor bars |
| Terminal box type | VYBO CB1-HV |
| Operating conditions | |
| Ambient temperature range (°C) | -20 to +40 (-30, +50, +60 optional) |
| Maximum installation altitude | up to 1000 m |
| Weight and surface finish | |
| Approximate weight | 2500 kg |
| Colour | RAL7030 |
| Paint finish | shiny |
| Bearings and lubrication | |
| DE/NDE bearings | 6322-C3/6322-C3 |
| Lubricant | Lithium-based grease No. 2 (temperature class) |
Lower operating losses, stable operation under high load and a better return on investment are reasons why this 1400 rpm electric motor is used in demanding production systems. The H27R 3551-4-6 model with an output of 355 kW is designed for applications where long-term efficiency, reliable torque transmission and sensible energy costs in continuous operation are expected from the drive.
IE4 efficiency reduces energy losses in large drives
IE4 Super Premium efficiency means in practice that the motor converts supplied electrical energy into mechanical work more effectively and wastes less of it as heat. In large technological systems, this is especially noticeable during long operating cycles, where every percentage point of efficiency is reflected in consumption and lower thermal loading of surrounding equipment. This three-phase electric motor therefore helps maintain economical operation even where output demands remain consistently high.
Welded steel frame simplifies handling and maintains precise geometry
The design with a welded steel frame provides high rigidity in a lighter solution than cast-iron castings, which designers and installation teams appreciate during transport and positioning of large units. A package weight of 2500 kg requires careful handling, but the rigid frame helps maintain mounting accuracy and mechanical stability even in operations with vibration or frequent starts.
Standard thermal protection and monitoring increase operating confidence
For high-power HV electric motors, it is important to monitor the condition of both the winding and bearings, so the solution is prepared for standard thermal protection and monitoring. In practice, this is supported by PT100 sensors in the winding and bearings, PTC thermistors and anti-condensation heating at 230 V, helping reduce the risk of cold starting after shutdown and monitor temperature conditions in good time. Insulation class F together with temperature rise B gives service teams a solid basis for safe protection sizing and integration into downstream automation. DE bearing 6322-C3 and NDE bearing 6322-C3 support rotational stability under continuous loading.
H27R 3551-4-6 is suitable for large technological systems
For OEM manufacturers and plant operators, it is important that the motor handles the load without unnecessary compromises in sizing. Rated current of 40,6 A, rated torque of 2280 Nm, power factor of 0,89 and efficiency of 94,9 % form a combination suitable for designing the power supply, switchboards and protective components. Rotor inertia of 7,0 kg·m² and load inertia of 205,0 kg·m² must be considered during starting, especially if the drive is to operate with frequent starts, long acceleration or load changes. When designing starting, it is important to account for starting torque reaching 0,85 times the rated torque, breakdown torque 2,2 times the rated torque and starting current 5,7 times the rated current. The 6000 V value also corresponds to deployment in demanding energy systems where precise coordination with the downstream HV distribution system is expected.
Typical industrial applications
- Main compressor stations in the chemical and petrochemical industries.
- Large pumping units for water-treatment plants and cooling circuits.
- Ventilation and extraction systems for metallurgical operations.
- Mills and crushers in raw-material processing and mining technologies.
- Conveyor-line drives in heavy production logistics.
- Machine assemblies for paper and pulp lines.
- Technological systems for power generation and auxiliary power-plant operations.
Why industrial projects choose this four-pole electric motor
This four-pole electric motor provides a balance of output, efficiency and robust construction for long-term deployment in manufacturing plants. Thanks to the H27R 3551-4-6 designation and VYBO Electric product support, it can be integrated more easily into projects requiring reliability in continuous operation, available service and clear technical continuity for subsequent project stages.
Performs where both output and reliability are decisive
If you need to select a motor for heavily loaded technologies with an emphasis on energy efficiency, mechanical rigidity and monitoring readiness, this model is a suitable candidate among modern HV electric motors. Contact us for a quotation, technical fine-tuning or project consultation.