Medium Voltage Switchgear

Medium Voltage (MV) refers to distribution systems operating between 1 kV and 72 kV. However, for practical and economic reasons, most medium voltage networks are limited to 36 kV.

Connecting an installation to a medium voltage utility network typically requires a dedicated substation, known as the main substation. Depending on the scale of the installation, additional secondary substations may also be necessary.

What is Medium Voltage Switchgear?

A full range of primary or secondary distribution MV equipment to control, protect, and isolate power distribution systems in electrical distribution, commercial, and industrial applications. The SeT series offers options up to 36kV and up to 72kV.

Why is MV switchgear used?

In electric utilities and in facilities with high electricity consumption, it detects, clears, and isolates faults from any downstream connected electrical equipment, protecting them from overloads. It provides a disconnection point from the upstream electrical grid to:

Isolate for maintenance
Automate for backup auto-transfer solutions
Integrate with microgrids

What are the types of MV switchgear?

The main types of MV switchgear are Air-Insulated Switchgear (AIS), Gas-Insulated Switchgear (GIS), and Shielded Solid-Insulated Switchgear (2SIS).

What is SF6-free MV?

It’s MV without SF6, developed to reduce CO2e and comply with regulations like the F-gas regulation. SF6-free switchgear offers an easy transition and high-performance option.

Air Insulated Switchgear for Primary Distribution

Primary Air Insulated Switchgear is our distribution switchgear that offers high-performance functionality up to 40.5 kV. With the use of air-insulated technology, this equipment protects high and medium-voltage electrical networks.

Air-Insulated Switchgears (AIS) use air as main insulator between the conductive components, which facilitates maintenance and handling.

Designed to offer high reliability and long service life, even in harsh environmental conditions.

Integrates safety devices to help protect operators and equipment from overloads and short circuits.

AIS is a modular switchgear, allowing flexibility and customization according to specific installation needs.

Our designs now include modern features like embedded arc flash protection, HMI, protection relays, and condition monitoring sensors to extend the life of your switchboard.

AIS includes various components such as:

Vacuum or SF6 gas Circuit Breakers, for interrupting fault currents.

Current and Voltage Transformers, for measuring electrical signals.

Disconnectors and Earthing Switches, for grounding with safer operations.

Surge Arresters, for protection against transient overvoltage.

Widely utilized across Energy Distribution, Industrial, and Renewable Energy sectors, AIS switchgear sets the standard for adaptability and performance.

Gas Insulated Switchgear GIS for Primary Distribution

What is primary gas-insulated switchgear (GIS)?
Medium voltage switchgear for primary distribution up to 52 kV using gas as insulation, enclosed in a metal enclosure and including high-voltage components like circuit breakers and disconnectors.

What are the benefits of primary GIS?

Space efficiency: Compact for use where space is limited, with applications from transformer substations to primary power supplies.
Reliability and longevity: The sealed design withstands harsh environments and offers long life with minimal maintenance.
Enhanced safety: Internal arc resistance and robust construction, including safety devices to protect operators and equipment from overloads and short circuits.

What are key features of primary GIS?
Compact size, high reliability, and strong performance.

Where is it used?
GIS is used in mining, petrochemical, oil and gas, renewables, container substations, railways, wind power, and critical infrastructure.

GHA

Gas-insulated switchgear with gas-insulated busbar for heavy duty applications up to 38kV. GHA is cCSAus listed and offers high ratings for 38kV applications. This robust, gas-insulated switchgear has a unique busbar system incorporating busbar link or B-Link technology which eliminates the need for gas handling on-site. This allows end-users to take advantage of the benefits of complete gas-insulation.

Part of SeT Series

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CBGS-0

Gas-insulated switchgear with solid dielectric busbar for applications up to 38kV. CBGS-0 consists of several functional modules. Each unit consists of a busbar compartment, main compartment (SF6 insulated), MV cable compartment, and LV cabinet. Much like Schneider Electric's other offerings, no maintenance is required in the main compartment and the busbar system allows for seamless installation without any gas handling.

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WI

Primary GIS MV Switchgear up to 52 kV 2500 A WI is a compact, modular, GIS switchgear for primary distribution. Panels are suitable for configuring single or double busbar switchgear.

Part of SeT Series

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PremSet

Discover the new compact MV Switchgear featuring SF6-free Shielded Solid Insulation (2SIS) and incidentally touch safe system. Premset dramatically improves the most important aspects of today's MV Switchgear. It introduces a compact (SF6-free), smart grid ready solution with the simplest installation and service procedures due to insulation and shielding of all live parts. Premset is the first ever MV Switchgear to attain the SILVER AWARD in electrical safety (voted by Plant Engineering).

Part of SeT Series

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Secondary Air Insulated Switchgear

Air-Insulated Switchgear (AIS) is a key component of secondary medium-voltage electrical distribution networks operating at 12 kV to 36 kV.

What are the key benefits of AIS switchgear?

With air insulation between live components, they offer peace of mind by simplifying the design and maintenance. Components are easily accessible for quick and efficient maintenance.
Modular design allows easy customization, expansion, and integration of additional units.
Safety and reliability provided by design with high safety standards, incl. arc resistance and advanced protection devices, to protect operators and equipment from overvoltage and short circuits.

Where is AIS switchgear used?
It perfectly fits various applications, from industrial facilities, large and commercial buildings, hospitals, airports to electrical distribution networks.

What are its advanced digital capabilities?
New IoT-connected features enable predictive maintenance to maximize efficiency and minimize downtime.

itional load break air switch with power fuse protection for power distribution.

HVL Switchgear

itional load break air switch with power fuse protection for power distribution. Square D’s HVL is the original open air switchgear for visual confirmation of load interruption. Power fuses provide short circuit protection. Interlocks ensure that the switch and fuse compartment remains closed until the switch is opened. NEMA 3R enclosures are available for outdoor applications.

Part of SeT Series

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Secondary Gas Insulated Switchgear

What is secondary gas-insulated switchgear (GIS)?
Secondary GIS are key components of medium voltage substations designed for MV applications from 12 kV to 40.5 kV. They use gas as the insulation medium between live components in a sealed-for-life design.

What are benefits of secondary GIS?

Compact design and modular structure save space and suit diverse environments.
Robust and reliable performance.
Reduced maintenance needs.
Enhanced safety with internal arc protection and monitoring systems to help protect equipment and operators

Where is it used?
Secondary GIS is used in urban distribution networks, industrial sites, renewables, critical infrastructure, data centers, airports, and public transport systems.

What are Ring Main Units (RMUs)?
RMUs are secondary GIS at load connection points in ring-type distribution networks. Our IoT-connected RMUs offer simple solutions with added benefits.