HT Switchgear

Earthing Rods

Lightning Arrestors

Switching Devices

Insulators, Bushings 

Circuit Breakers


Power Cables

Instrumentation Cables

Heat Resistant Cables

Underwater Cables

Power Cables

Name Website Country

Finolex Cables India
1.1KV Aluminium / Copper conductor with PVC & XLPE insulation

Nu Core USA
Flexible Power Cables

Kaydour Cables India
Manufacturers of Power and Control Cables

RPG Cables India
XLPE cables from 66 V to 132 kV in India

Delton Cables India
L.V.   XLPE  insulated unarmoured  and Armoured Power Cables

Gallant and Wein USA
Manufacturers of all types of Cables

Circuit Breakers

Name Website Country

ABB Global
Provides a wide range of Circuit breakers fo different ratings and types

Siemens Global
Manufacturers Circuit breakers upto 800kV

General Electric Global
Circuit Breakers, Motor Circuit Breaker and Arc Fault Circuit Interruptor

Hyosung Power and Industrial Systems China
Manufacturers of Circuitbreakers, Reactors and Transformers

High Voltage AE Power Systems USA
Manufacturers of SF6 and nonSF6 breakers

Bharat Heavy Electricals Limited India
Leading Manufacturer of Switchgear and Electric Machines

The Non Contact High Voltage Indicator is a safety device which indicates with a buzzer sound and flashing light whether a conductor or an equipment is live or not. 

When working with High Voltages, it is extremely important to ensure that we know which equipment is live and which equipment is dead.

Too often, engineers and workers are exposed to severe injuries or even death when someone accidentally gets exposed to live conductors or tries to connect a test equipment to a conductor which they thought was dead.

Hence, it is absolutely essential that we ensure that equipment does not have any voltage and is discharged before we begin work.

The Non Contact High voltage indicator works by sensing the electric charge lines emanating from a point at high potential.  Since, these lines of electric charge can be detected at a distance from the conductor, contact with the conductor is not necessary.  The Non contact high voltage indicators available in the market can be used to detect a wide range of voltage from 80V to nearly 500kV.  These indicators are usually powered with alkaline batteries.

Each High voltage detector has a inbuilt test function which tests the device for functionality prior to use. 

The Non Contact High Voltage Indicator is held near the live conductor using a hot stick.  Gloves of the appropriate rating should be worn when using the equipment. 

AC voltages have been classified in various manners.  In earlier times, there were just two categories LV and HV.  As the level of voltages increases, there was a need for more levels.  However, there was ambiguity as to where each band ended and the other began.  For instance, 11kV can be MV in some systems and HV in another. 

The International Electrotechnical Commission has classified the voltages into the following levels(IEC 60038).  This classification system is fast gaining acceptance. 

Low Voltage           - upto 1000V

Medium Voltage     - 1000V to 35kV

High Voltage           - 35kV to 230 kV

Extra High Voltage  - above 230 kV.

In some situations, the term Ultra High Voltage is used to denote voltages above 800 kV.

In addition, the IEC defines a voltage band known as the Extra Low Voltage with a AC voltage less than 70 V.  See article here.

Generator  Protection Relay

Name Website Country

Selco Denmark

ABB Global

Schweitzer Engineering Laboratories Global

Vamp Engineering Finland

Transformer Protection Relay

Name Website Country

Siemens Global

Selinc Engineering Laboratories Global
Transformer relay protection with Transformer condition tracking and Thermal Monitoring

Basler Global

ABB Global

GE Protection and Control Global

Toshiba - Transmission and Distribution Global
Numerical Transformer Protection Relay with metering and recording


Harmonic Filters

Name Website Country

Schaffner Group Global
Manufacturers both Active and Passive Filters

MTE Corporation USA
Solutions for both Three phase and single phase applications

Harmonic Filters India India
Harmonic Filters for Steel Industries

ABB Global
Tailor made Harmonic Solution incorporation a wide variety of harmonic filters

FUSS EMV Germany
Manufacturers of EMC filters, line suppression chokes and Harmonic Filters

Shandong Hoteam Technologies Co., Ltd. China
Active and Passive Harmonic Filters and reactive power compensation equipment

Claritas India India
Suppliers of Tuned and detuned harmonic filters

Enertech UPS India
Manufacturers of Active Harmonic Filters

Harmonic Analyzers

Name Website Country

Meco Instruments India
Power, Leakage and Harmonics Analyzer

Extech Instruments Global
Three Phase Power and Harmonics Analyzer

Fluke Global
Power and Harmonics Analyzer 

Dranetz USA
Hand held Power and Harmonics Analyzer

TES Electrical and Electronic Corporation Taiwan
Harmonics Analyzers

Power Analyzers

Name Website Country

Fluke Corporation Global
Wide range of High Precision Power Analyzers

Cole Parmer Global
Three Phase Analyzers  providing Harmonics Analysis

Medusa Products USA

Yokogawa Global
Manufacturers of Power Analyzers for both basic and High Precision applications

Extech Instruments Global
Hand held Power and Harmonics Analyzers

Voltech Global
Manufacturers of Power Analyzers and Transformer Testers


Name Website Country

Tektronix Global
Manufacturers of Basic, Bench level and Performance Oscilloscopes

Extech Instruments Global
Dual Channel Oscilloscopes from 5 Mhz to 60 MHz

Agilent Technologies Global
Wide range of hand held, portable and sampling oscilloscopes

Fluke Corporation Global
Multi Channel Handheld Oscilloscopes (Scopemeters) for a diverse applications

Hart USA Global
Suppliers of Oscilloscopes of leading Brands

Gaotek Inc. USA
Hand Held oscilloscopes and PC based oscilloscopes

Gwinstek Taiwan
Digital Storage Oscilloscopes

Rohde & Schwarz. Global
Oscilloscopes from 500 MHz to 1 and 2 GHz

Harmonics Mitigating transformers are special kind of transformers which are used to mitigate harmonics in the connected loads. They are often confused with K Transformers. K Transformers(Refer Article) is a type of transformer which is over sized to cater to loads which generate harmonics. A Harmonics Mitigating Transformer, however, works by passively suppressing the harmonics.

Harmonics Mitigating Transformers are designed like ordinary transformers except that they have specific phase shifts (+15 deg, -15 deg, 30 degs). The primary winding is usually delta while the secondary winding is a zig zag winding. The zig zag winding of the secondary cancels a particular order of harmonics depending on the phase shift.

A Harmonics Analysis is conducted to identify the order of the harmonics generated before choosing the type of Harmonics Mitigating Transformer

The harmonics are prevented from reaching the primary and affecting transformer output. Harmonics Mitigating Transformers fall under the passive methods of harmonic suppression.

The circular mil is a unit of area which is used to specify the size of wires.  The mil is a thousandth of an inch which corresponds to 0.0254mm.  The circular mil is the area of a circle whose diameter is 1 mil.  The mil is also known as thou (thousands of an inch).

The circular mil is used as the area of the circle can be calculated without the use of Pi.

Thus the cross-sectional  Area of the circle wire = D2
     where D is the diamter of the circle in mils.

Larger wire sizes are rated in MCM or Thousand circular Mils.  If the conductor cross section is square shaped, the size will be indicated in Square mils.

Square Mils = π/4 * D2

Air Leakage Test Kit
          Electrical Protection Gloves are an important part of the personnel protective equipment of people working in electric equipment.  Electrical Gloves should be used when working on High voltage equipment (See article on Electrical Gloves).

           Using damaged electrical gloves which do not have the required dielectric strength can seriously compromise safety and is extremely dangerous.  It is therefore essential to check electrical Gloves at regular intervals.  Electrical Gloves should be checked before they are issued to personnel and after every six month thereafter.  Electrical Gloves need to be checked for physical integrity and for insulating strength. 

               Physical integrity checks involve checks for cuts,abrasions or punctures.  This done by blowing air into the gloves and checking for any leakage.  There is no specific method to do this.  Just blowing air into the glove and them observing for any loss of air would be sufficient. Special Glove testers are available in the market. 

Insulation Test for Gloves
               The other test to be done on the gloves is the dielectric strength test.  Electrical gloves are rated by the voltage they should be used on.  It is necessary to test the gloves at this voltage.  The test is done by a special apparatus.

               The gloves are hung on holders and then filled with water.  The gloves are then immersed into the liquid bath.  A high voltage is applied between the water inside the glove and the water in the bath.  If current flows through the glove, the glove is rejected. 

               Glove testing should be carried out after every incident.

          Ultra Isolation Transformers are a type of isolation transformers used in sensitive electronic systems.  They are also known as noise-cut off Transformers. 

          Isolation Transformer are transformers which are used to provide isolation between two parts of a circuit.  Isolation Transformers work by using a grounded shield between the primary and the secondary winding.  This shielding is used to prevent capacitive coupling between the primary and the secondary.

          Nevertheless, ordinary isolation transformers may not be enough for sensitive electronic systems such as those in hospitals, digital communication systems and sophisticated telemetry systems where the measured signals can be distorted due to noise and other disturbances.  Noise, spikes and transients can cause damage to sensitive electronic equipment.

          Ultra Isolation Transformers filter out noise other disturbances caused by switching transients. While they are constructed similar to isolation transformers, an electrostatic shield is used to reduce the capacitive coupling between the primary and the secondary.  The filtering effect is bi-directional i.e. any noise produced by the equipment connected to the ultra isolation transformer will also not be transmitted to the system.  Noise generating loads can thus be contained.

Ultra Isolation Transformers can also be used in a cascade.  The cascade greatly increases the filtering effect produced.

Control Transformers are transformers which are used in control circuits of motor control circuits, auxilliary relays, etc.  These transformers step down the main power supply to a lower value which can be fed to the relays and contactors in the circuit. 

For instance, a crane whose motors require 440 VAc will have a control circuit which operates at 230V. The 230V power supply can be drawn from a step-down transformer which is connected to the mains power supply.

Control transformers make it simpler by drawing the power for the control circuit from the main power supply instead of having a separate power source.  The voltage for the control circuit can be 230 V or 110 V.  Lower voltages are also possible.  Low voltages may be necessary in hazardous environments. 

Another advantage of the control transformer is the isolation is the excellent transient response it provides.  When heavy contactors or electromagnetically operated valves are switched on, a high inrush current results.  The control transformer is able to withstand such high inrush currents and prevent any instability to the main power circuit. 

The control transformer should be designed to provide the steady state kVA demand of the control circuit.  In addition, it should also be capable of providing the inrush kVA demand which is the initial kVA when all the contactors and other coils may be switched on at the same time.  

Lighting Transformers are usually used in residences, swimming pools, gardens to specifically feed lighting loads.  These transformers step the low voltage of the distribution system, 230 V to a still lower voltage (Extra Low Voltage) 12V or 24 V.  

The use of such low voltage, enables the design of smaller lights.  In applications such as lighting in swimming pool or gardens, lighting transformers producing voltages less than 30 V are used for safety reasons.

Lighting transformers are usually hidden in the ceiling or in the ground on in a recess in a wall.  Since the output voltage of the lighting transformer is quite low, they need to be placed very near the lighting load to avoid any drop in the voltage. 

A single lighting transformers can power more than one lighting load.  Lighting transformers for outdoor applications are designed with weatherproof enclosures. Lighting transformers can be classified into two major types, the electromagnetic type transformers and the electronic transformer type. 
The electromagnetic type transformer is designed like a conventional step down transformer.  A toroidal core is usually used to avoid the humming noise from the transformer.  

Lighting transformers also provide protection against surges, spikes and other transient phenomena

Synchronous Generators

Name Website Country
Cummins Generator Technologies Britain
Produces generators from the range of 600VA to 20,000 kVA

ABB Global
Manufacturers a wide range of Synchronous Generators

EME GmBH Germany
Provides a range of Synchronous Generators from 150 to 1100kVA  

Marelli Motori Italy
Manufacturer of Synchronous generators suitable for industrial, marine and hydropower environment and applications   

WEG Global
Manufacturers upto 4200 kVA

GE Power Global
Manufacturers of a wide range of alternators for diverse applications

Leroy Somer Global
Manufactures alternators upto 20 MW

Voltage Transformers

Name Website Country

ABB China
Manufacturers of a wide range of voltage Transformers

Prima Transformers India
Manufacturers of voltage Transformers of various capacities

Siemens Germany
Manufacturers of wide range of Voltage Transformers

ABC Transformers India

Servokon Systems India

MEW India India
Manufactures Voltage Transformers from 11kV to 33kV

Aya Instruments India
Voltage Transformers for both Single and Three phase applications

Himayal India
Voltage Transformers for a range from 10 kV and 35 kV

Baoguang Group Co. China
Provide a wide range of indoor and outdoor voltage transformers

Huayi Electric Apparatus Group China

SCT Limited India

Contact Us

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If you have a website you would wish to add to our database, please click here

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Induction Motors

Name Website Country

Elcen India
Provide Induction motors for diverse applications  

Combimac B.V. Germany

Elnor Motors Belgium
Customized Induction Motors

Helmke Germany
Stockist for induction motors   
Bharat Bijlee India

Crompton Greaves India Ltd India

Yanan Motor

Synchronous Motors

Name Website Country
Motion Drivetronics Pvt. Ltd. India
Manufacturers of synchronous motors, synchronous gear motors, AC synchronous electric motor, AC synchronous gear motor, uni-directional motors and bi-directional synchronous motors.

Shenzhen Power Motor Industries Ltd China
Manufacturers of Synchronous generators based in China

Leroy Somer France
Manufactureres of Permanent Magnet Synchronous Motors Switzerland
Manufacturers of a wide range of Synchronous Motors

General Electric USA
Manufacturers of Synchronous Motors

Suhder Motors Taiwan
Manufacturers of Permanent Magnet, Reversible and Hysteresis Synchronous Motors based in Taiwan

EME GmBH Germany
Provides a range of Synchronous Generators from 150 to 1100kVA

Marelli Motori Italy
Manufacturer of Synchronous generators suitable for industrial, marine and hydropower environment and applications 

China Electric Motor China
Manufacturer of Synchronous Motors Based in China

Induction Generator

Name Website Country
ABB Global
Supplies both constant speed and variable speed induction generators

Teco Westinghouse Global
Manufacturers of induction generators for wind power solutions

Jyoti Ltd India
Manufacturers of induction generators

Siemens Global

Frameless motors as the name suggests, are motors which do not have a frame.  The stator and the rotor are delivered separately and are assembled to the load.  Thus, the motor does not have bearings.  The rotor is directly coupled to the load while the stator is coupled to the frame of the machine.  These motors are custom designed to meet the speed requirement.

Thus this arrangement eliminates the need for the coupling.  This increases the stiffness of the power train of the machine.  It also eliminates torsional application.  The size of the motor is also considerably reduced to around one seventh. This reduced weight for a given power output reduces inertial in the machine and enables quick movements and direction reversals.  

A hand tool with Frameless Motor
Frameless motors are widely used in Hand tools, Medical devices, in satellite technology and in semiconductor equipment. 

Vibration motor used in cellphones
Vibration motors are motors which deliberately generate vibration.  These motors are used in mobile phones to create vibration alerting the user to a call or a message.

They are also used widely in the industries such as in construction industry to vibrate the concrete so that air pockets are not formed which the concrete is solidifying.  They are also used in mixers to prevent material from being left behind after the mixing process is over.

Vibration motors are also used in flour mills, pharmaceutical, food industries, etc to facilitate the smooth flow of materials in conveyors, hoppers and other mixing equipment. 

These motors are constructed just like normal motors.  However, they have a mechanically unbalanced weights attached to the output shaft.  These unbalanced weights create vibration.  The frequency and the magnitude of the vibration can be changed by modifying the shape and weight of the counterweights.