Browsing all articles in Switchgears
Feb
7

High Voltage Fuse

A fuse interrupts excessive current (blows) so that further damage by overheating or fire is prevented. Wiring regulations often define a maximum fuse current rating for particular circuits. Over current protection devices are essential in electrical systems to limit threats to human life and property damage. Fuses are selected to allow passage of normal current plus a marginal percentage and to allow excessive current only for short periods. Slow blow fuses are designed to allow higher currents for a modest amount of time longer, and such considerations are and were commonly necessary when electronics devices or systems had electronic tube tech or a large number of incandescent lights were being powered such as in a large hall, theater or stadium. Tubes and incandescent lights each have reduced current needs as they heat up to operating temperatures for their internal resistance grows as they are heated— the same physics principle causes the fuse material to melt, disconnecting the circuit from power.

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Dec
13

About National Switchgears

Author admin    Category Switchgears     Tags

Founded in 1984, Ahmedabad Corporation National Switchgear was started with a primary focus of serving the electrical service shop industry with quality surplus Circuit Breakers, GOAB switch (operated air break switch), Drop Out Fuse and Operating Rod for Drop Out Fuse. Sharad Mehta, company co-founder and president, had a simple mission: operate with integrity and provide our customers with unparalleled responsive service and quality equipment.

Since conception, National Switchgear has moved from strength to strength, but we have never abandoned the focus of providing customers value through quality products and responsive service. Responding to customer needs, national switchgear created a new division focused on full-service electrical testing and onsite electrical maintenance services.

Today, National Switchgear deal’s in HT & L.T. Porcelain Insulators, Transmission line material and sub-station equipment, Overhead Line Material, Lightning Arrester, Fuse Elements, Galvanized Hardware, Stay set, Rubber Hand-Gloves, Rubber Sheet, A.C.S.R. Conductor and many more.

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Dec
12

What Is Switchgear and How Does It Work?

Switchgear refers to electrical equipment that regulates the flow of electricity within an electrical system. It is used by utility providers and private facilities alike for two reasons: to prevent overloads and short circuits, and to de-energize circuits for testing and maintenance. The most familiar types of switchgear are circuit breakers and fuses, which interrupt the flow of electricity to a circuit when its current becomes too high; and power transfer switches, which transfer a buildings source of electricity from a primary source to a secondary source, such as accessing generator power during a power outage.
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Nov
21

About Disconnecting Switch.

Disconnecting Switch

Disconnecting Switch

A Disconnect switch is a switch which has the capability to interrupt power to an electrical circuit or to a group of electrical circuits. Disconnect switches are used in a wide variety of settings, and are primarily employed as safety devices which de-energize circuits so that people can work on them safely. Electrical safety devices are only as useful as their maintenance and the surrounding safety procedures, and a disconnect switch must be used properly in order to be effective.

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Nov
14

What is a Lightning Arrester?

Lightning Arrester

Lightning Arrester

 

According to most definitions, a Lightning Arrester is a Device Used on Power Systems above 1000V to Protect other Equipment from Lightning and Switching Surges.

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Nov
14

Porcelain Insulators

Porcelain Insulator

Porcelain Insulator

A Insulator made by hard paste of Porcelain is also known as true porcelain insulator. Out of all the wide varieties of ceramics & true porcelain is the hardest, the most durable – which is one of the reasons porcelain insulator are largely replaced glass insulators, beginning in the nineteenth century – porcelain was first created in China, and to this day that country is the source of most superior porcelain products, such as electrical porcelain insulator. In fact, the world’s largest manufacturer of electrical Porcelain insulator is located in Dalian, China.

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Nov
11
Nov
10

Use & Types Of AB Switch (G.O.A.B Switch)

Use Of AB Switch (G.O.A.B Switch). (National Switch is a AB switch supplier in India)

Application

The triple pole AB switch is gang operated and designed for outdoor application. The switch is designed to suit overhear systems used in high density urban situations or high load centers, where the load is much higher and the need of improved and steady quality supply is much greater. Main function of this product is to isolate the Transformer, Overhead lines, System or Cables from distribution network.

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Mar
26

Drop Out Fuse

D O fuse

D O fuse

DROP OUT FUSE (D.O.Fuse) ARE COMPLETE WITH FUSE CARRIER OF FIBRE GLASS TUBE WITH BOTH END HEAVILY TINNED NON FERROUS METAL PARTS. THE BRUSH TYPE PHOSPHOR BRONZE CONTACTS PROVIDE POSITIVE HIGH PRESSURE MULTILANE CONNECTION AND WIPING AND CLEANING ACTION ON CLOSING. THE PRESSURE EXERTED BY THE CONTACTS INITIATES THE OPENING MOVEMENT OF THE FUSE CARRIER COPPER & COPPER ALLOYS HIGH PRESSURE HEAVILY TINNED METAL CONTACTS FOR FIX TOP CONTACTS ASSEMBLY AND BOTTOM CONTACT ASSEMBLY. THE D.O. FUSE UNITS ARE MANUFACTURED FROM 11 KV TO  33KV SYSTEM.

Mar
25

GOAB Switch

 

AB Switch Tilting Type

AB Switch Tilting Type

11 & 33 K V Gang Operated Air Break Switch Complete with Handle, Liver, Operating & Coupling Pipe & Hardwares.

This Product are available in different seize & Dimension, as per requirement by Nigams Specification.

The Male, Female Contact Parts made by Metal Parts & M.S. Flat coated copper strip and Bearing moves the male contact made by C. I. & M.S. Sheet.

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National Switchgears
403, Ashwamegh Avenue,
Near Mithakhali Six Road,
Navrangpura,
Ahmedabad - 380009
Gujarat - INDIA

Mobile: +91-9879539725
Tel / Fax +91-79-26461471

Email ID: info@national-switchgears.com
sharad.mehta61@gmail.com

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