Air insulated switchgear

AIS - air-insulated medium-voltage high quality installation: DW-3

We engineer reliable switchgear built on safety and durability

With the DW-3 we have extended our knowledge and know-how of the DW-2 to applications with higher technical requirements. Our DW-3 is a modular concept combining all medium voltage functions. Therefore, we provide made-to-measure solutions for all your medium voltage needs.

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DW-3 air insulated medium voltage cells

Modular design

Metal clad

Higher Circuit

The DW-3 system is a modular concept based on the “building blocks” principle, which means that cubicles are produced in series. As a result, the modular DW-3 concept meets the highest technical standards in a rational, economically sound way. The combination of cubicles is unlimited.

Our DW-3 system is intended for higher currents (>>1250A), which makes it ideal for heavy industries. It also peaks in safety levels by being armored between the compartments, having withdrawable circuit breakers and you have an indication through the window of our cubicles. Manual operation of the cubicles requires minimal switch force. The clean and neat synoptic diagram provides a clear and safe overview of the different positions of the various parts of the cubicle.

SGC offers a wide range of applications with the DW-3 cubicles and associated air insulated switchgear solutions. Every cubicle contains all functional interlocks which allows for effortless application. That’s according to all current standards. Therefore, DW-3 allows installation in consumer work spaces. That results in minimal capacity loss.

For all your needs and demands, the DW-3 cubicles and associated air insulated switchgear provide a solution: it can replace obsolete installations and extend existing installations, and it is also perfectly suitable for entirely new constructions.

DW-3 opstelling
Technical specifications

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Modular air insulated switchgear: The DW-3 system

  • Air Insulated Switchgear: metal clad AIS cubicles with galvanized steel sheets 2mm and armored between the compartments
  • Modular system - combination is unlimited
  • Higher circuit – heavy industries
  • Remote control operation or manual/automatic
  • Can be equipped with a wide range of optional features

Equipped with a robust two-position load break switch RV-44 (open or closed), that is sealed for life. Can withstand a pressure of 800 A and optional 1250 A (double busbar system). DF-3 ’s modular design allows you to create rational, economical & custom-made combinations of medium voltage cubicles (with a rated voltage 12,17 or 24 kV). The position of the load break switch is clearly indicated in the single line diagram. The position can be controlled at all times, not only by the synoptic but also through the two inspection windows integrated in the front door of the cubicles. This kind of load break switch has large contacts and can withstand the voltage with pressure.

Our DW-3 AIS product line

Discover the product that’s right for you. We, at SGC, are here to help you choose the best solution. Besides the popular DF-2 and compact DF-3 range, you have the DW-3. This is our strongest product. With it’s intention for higher current, it’s ideal for heavy industries.

Besides that you have withdrawable circuit breakers as an extra safety mechanism. Guaranteed operator safety, co-engineering and long-lasting quality are some of the reasons why SGC is a preferred partner.

Want more information? Our team is here to help. Contact us today

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Technical specifications

Rated voltage (kV)17,5 kV
Rated cubicle current (A)630 1250 2500
Rated current of the busbar (A)2500
Rated frequency (Hz)50, 60
Rated power-frequency withstand voltage of the main circuit (kV, 1 min)38
Rated power-frequency withstand voltage of secondary circuits (kV, 50 Hz, 1 min)2
Rated lightning impulse withstand voltage (kV)95
Rated permissible short-circuit current (kA)31.5
Rated short-circuit duration (s)3
Peak value of the rated short-circuit current (kA)80
Rated internal arc withstand current ((1s), kA)31.5
IAC arc resistance classificationAFLR 31.5 kA 1s
Degree of protectionIP4X
Maximum ambient temperature (° C)+40
Minimum ambient temperature (°C)-5/-15 *
Maximum altitude above sea level (m)1000 **
Maximum relative humidity95%

** For installations at altitudes higher than 1000m, the insulation withstand level of external insulation at the service location has to be determined by multiplying the rated insulation levels by a factor Ka in accordance to IEC 62271-1.

DF-3 projects

Solar power plant with SGC DF-2 switchgear in Chad

Solar photovoltaic power plant with SGC DF-2 equipment commissioned in Bithéa, Abéché, Chad

Within the switchroom, NHP specified the SGC DF-2 air-insulated switchgear module with a built-in…

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ISO certificate extended until 2024

At SGC, we hold quality in high esteem and want you to be maximally satisfied with our quality in…

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Bezoek Stad Deinze

Visit of the Trade delegation from Central African Republic

Switchgear Company invited the Trade delegation of the Central African Republic from the…

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Solar power plant with SGC DF-2 switchgear in Chad

Solar photovoltaic power plant with SGC DF-2 equipment commissioned in Bithéa, Abéché, Chad

Within the switchroom, NHP specified the SGC DF-2 air-insulated switchgear module with a built-in…

Read More

ISO certificate extended until 2024

At SGC, we hold quality in high esteem and want you to be maximally satisfied with our quality in…

Read More

Bezoek Stad Deinze

Visit of the Trade delegation from Central African Republic

Switchgear Company invited the Trade delegation of the Central African Republic from the…

Read More

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We excell in co-engineering made to measure solutions

Innovation and care for the environment are the driving forces behind our products and our company. A lot of our products are developed from co-engineering with clients, supplying solutions that fit their needs and specifications.

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Our SwitchGear projects worldwide...

How to operate DW-3

Here you can find a video playlist (Youtube) that shows how to operate DW-3 in 7 video’s (parts).