Product Brief

Jayashree HFSR Soft Starters are advanced, harmonics-free series reactor soft starters designed for smooth starting of LT/HT squirrel cage induction motors up to 35 MW/13.8 KV.

With over 30 years of proven field performance and more than 5000 installations worldwide, these soft starters intelligently control motor starting current, providing a reliable, energy-efficient solution for industrial applications.

Product
Description

The Jayashree HFSR (Harmonics Free Series Reactor) soft starters use a series impedance method, where specially designed air-cored reactors act as impedance in series with the motor winding, gradually applying voltage during motor startup. This reduces the starting current and torque compared to Direct On Line (DOL) starters, ensuring smooth acceleration and avoiding mechanical shocks.

 

 

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Product
Applications

Mining & Minerals

Soft starters enable smooth and reliable starting of crushers, conveyors, and dewatering pumps, reducing mechanical stress in demanding mining environments

Water Treatment and Supply

They provide gentle motor starts for large water pumps and compressors, protecting infrastructure and extending pump life in municipal and industrial water supply systems.

Power Generation and Utilities

Soft starters control the ramp-up of fans, compressors, and auxiliary motors, preventing electrical surges and ensuring reliable plant operation

Oil, Gas, and Petrochemicals

They safeguard compressors and process pumps by preventing abrupt torque transmission, protecting sensitive pipelines and equipment in hazardous environments

Cement and Materials Handling

Used for cement kiln fans, crushers, and conveyor belts, soft starters reduce start-up current and mechanical stress, increasing uptime and reducing maintenance in cement plants

Building Services and Infrastructure

In HVAC, escalators, and large building pump systems, soft starters enable smooth starts and stops, reducing wear and supporting energy efficiency in commercial infrastructure.

Key
benefits

Reduced Starting Current

Limits starting current to 3 to 3.5 times full load current (FLC), with options to reduce to 1.2 times FLC using DCC panels

Reduced Mechanical Stress

Smooth and step-less acceleration minimizes torque surges, extending motor and driven equipment life.

Harmonics-Free Operation

Air-core reactors avoid core saturation and harmonic generation, maintaining sinusoidal power supply quality.

Reliable and Low Maintenance

Vacuum impregnated coils and natural air cooling ensure long-term reliability without maintenance

Comprehensive Control & Protection

Advanced PLC and HMI system provides complete monitoring, fault diagnostics, and data logging.

Wide Application Range

Suitable for motors from low voltage to high voltage (up to 13.8 KV) and motor ratings up to 35,000 kW.

Installation
Types

  • The HFSR soft starters are floor-mounted, free-standing units suitable for indoor environments with cable entry from bottom or sides.
  • The reactor module includes taps for onsite fine tuning of starting performance matching the specific load and motor characteristics.

Mechnical & Technical
Specifications

Coil Type

Constructed with high-grade copper coils insulated to Class H/F standards.

Reactor

Air-cooled air-core reactor design to prevent humming and losses.

Fabrication

Floor-mount cubicle made from 2-3 mm thick CNC fabricated sheet steel.

Protection class

IP42 suitable for indoor installation.

Auxiliary supplies

110 VDC/240 VAC.

Voltage

415 V up to 13.8 KV, 50/60 Hz frequency.

Why Choose Our HFSR soft starters?

This intelligent impedance control avoids the mechanical stresses and electrical shocks typical to direct on line starting, enabling safe and efficient motor starting even for large industrial drives.

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