24kV switchgear is medium-voltage electrical equipment designed for power distribution systems requiring equipment with a rated voltage suitable for 24kV-class applications. Depending on the design, it can include vacuum circuit breakers, busbars, disconnectors, earthing switches, protection relays, current transformers, and cable compartments.

24kV switchgear is used in a range of applications, including utility distribution, industrial substations, renewable energy projects, commercial infrastructure, and transformer protection.

For buyers, the important point is that 24kV is only one specification. Rated current, short-circuit capability, insulation level, internal arc requirements, environmental conditions, and applicable standards should also be evaluated.

What Is 24kV Switchgear?

24kV switchgear is a medium-voltage switchgear solution designed around a 24kV-class rated voltage.

Its functions can include:

• Switching feeders
• Protecting electrical equipment
• Isolating circuits
• Connecting transformers
• Controlling power distribution
• Providing operational and maintenance isolation

A typical metal-enclosed 24kV switchgear lineup may contain separate compartments for:

• Circuit breakers
• Busbars
• Cable connections
• Instrument transformers
• Low-voltage controls

The exact configuration depends on the application.

For example, an industrial substation may require several feeder panels and a bus coupler, while a renewable energy project may use a different arrangement for collecting power from multiple transformers.

Why Use 24kV Switchgear?

24kV-class switchgear can be useful for distribution networks where the system voltage and insulation coordination require equipment in this voltage class.

Potential applications include:

• Utility distribution
• Industrial power systems
• Transformer substations
• Solar power plants
• Wind farms
• Battery energy storage
• Commercial buildings

The equipment should be selected according to the actual maximum system voltage and applicable insulation requirements rather than simply matching the nominal voltage.

Key 24kV Switchgear Ratings

A reliable switchgear specification needs considerably more information than “24kV.”

Rated Voltage

The rated voltage must be appropriate for the system and the applicable standard.

Buyers should confirm the relationship between the network’s nominal voltage, maximum operating voltage, and equipment rated voltage.

Rated Current

The continuous current rating should match the expected load.

Consider:

• Transformer capacity
• Feeder loading
• Continuous operating current
• Future expansion
• Ambient conditions

Short-Circuit Breaking Current

The circuit breaker must be capable of interrupting the specified fault current.

This value should come from the project’s electrical system study rather than being selected arbitrarily.

Short-Time Withstand Current

This rating indicates the current the equipment can withstand for a specified period during a fault.

It is particularly important for busbars and other current-carrying parts.

Peak Withstand Current

Peak withstand capability relates to the mechanical stresses produced by high fault currents.

Insulation Level

The equipment’s dielectric ratings should also match the project’s insulation coordination requirements.

These can include:

• Power-frequency withstand voltage
• Lightning impulse withstand voltage

The appropriate values depend on the applicable standard and equipment configuration.

24kV Vacuum Circuit Breaker Switchgear

Vacuum circuit breakers are widely used in modern medium-voltage switchgear.

A vacuum interrupter provides current interruption inside a sealed chamber.

For 24kV applications, vacuum circuit breakers can be integrated into metal-enclosed switchgear together with:

• Protection relays
• Current transformers
• Voltage transformers
• Operating mechanisms
• Interlocking systems
• Auxiliary control circuits

Potential advantages of vacuum switching include:

• Compact interruption technology
• Low routine maintenance requirements
• No SF6 gas inside the vacuum interrupter
• Suitable interruption performance for many MV applications

However, the circuit breaker is only one part of the switchgear.

A complete 24kV switchgear assembly must also meet the applicable requirements for its enclosure, insulation, busbars, cable compartments, protection system, and testing.

Types of 24kV Switchgear

Metal-Enclosed Switchgear

Metal-enclosed construction provides separate compartments for major electrical components.

This type of configuration is commonly used in industrial and utility applications.

Vacuum Circuit Breaker Switchgear

VCB-based switchgear uses vacuum circuit breakers for switching and protection.

It can be configured for:

• Incoming feeders
• Transformer protection
• Outgoing feeders
• Motor feeders
• Bus sectionalizing

Ring Main Unit

24kV Ring Main Units can be used in medium-voltage distribution networks requiring compact switching equipment.

Depending on the design, an RMU can combine:

• Load switches
• Circuit breakers
• Earthing switches
• Protection devices

Solid Insulated Switchgear

Solid insulated switchgear uses solid dielectric materials for insulation.

It can be considered where compact construction, environmental protection, or SF6-free design is important.

Gas-Insulated Switchgear

Gas-insulated switchgear can provide compact equipment configurations.

However, buyers should identify the specific insulating gas used rather than assuming that all gas-insulated equipment uses the same technology.

Where Is 24kV Switchgear Used?

Utility Distribution

24kV switchgear can be used in distribution substations and medium-voltage networks where the voltage class is appropriate.

Typical equipment can include:

• Feeder panels
• Incoming panels
• Bus couplers
• Transformer feeders
• Earthing equipment

Industrial Plants

Large industrial facilities may use 24kV switchgear for plant distribution and substation applications.

Potential uses include:

• Main incoming power
• Transformer feeders
• Motor feeders
• Process equipment
• Plant distribution

Solar Farms

Solar power projects use medium-voltage collector networks to combine output from multiple transformer stations.

24kV-class switchgear may be suitable where the collector network has matching voltage and fault-level requirements.

For solar projects, buyers should also consider:

• Outdoor conditions
• Remote monitoring
• Maintenance access
• Protection coordination
• Equipment enclosure

Wind Farms

Wind farms can use medium-voltage equipment to collect power from multiple turbines.

The equipment may need to operate in:

• Remote locations
• High-wind environments
• Low-temperature conditions
• High-humidity environments

The manufacturer’s environmental specifications should therefore be reviewed carefully.

Battery Energy Storage

Battery energy storage systems use medium-voltage equipment to connect power conversion systems, transformers, and grid connections.

24kV switchgear can be considered when its voltage and fault ratings match the system design.

Data Centers

Large data centers may use medium-voltage switchgear for utility incoming power and transformer distribution.

The design should account for redundancy, protection coordination, maintenance strategy, and operational continuity.

24kV Switchgear and IEC Standards

The applicable standards depend on the specific equipment.

The IEC 62271 series provides an important standards framework for high-voltage switchgear and controlgear, including equipment commonly used in medium-voltage systems.

Different parts address different equipment types.

For example, applicable standards can cover:

• Common switchgear requirements
• AC circuit breakers
• Disconnectors and earthing switches
• Metal-enclosed switchgear
• Gas-insulated equipment
• Testing requirements

For 24kV equipment, buyers should request the manufacturer’s exact standards declaration and test documentation.

Avoid relying solely on a statement such as “IEC compliant.”

The more useful question is:

Which IEC standard applies to this exact product configuration, and what test documentation supports compliance?

Internal Arc Requirements for 24kV Switchgear

Internal arc protection can be an important requirement for medium-voltage switchgear installed where personnel may work nearby.

Applicable switchgear standards can define Internal Arc Classification (IAC) requirements.

An IAC specification can address:

• Accessibility
• Tested sides
• Test current
• Test duration

The required classification should be established during project engineering.

Arc-resistant construction can involve:

• Reinforced enclosure
• Secure doors
• Controlled pressure relief
• Compartmentalization
• Defined gas exhaust paths

However, arc resistance applies to a tested equipment configuration.

A circuit breaker being rated for 24kV does not automatically mean that the complete switchgear is arc resistant.

Indoor vs Outdoor 24kV Switchgear

Indoor 24kV Switchgear

Indoor equipment is installed in a controlled electrical room.

Advantages can include:

• Reduced direct weather exposure
• Controlled environmental conditions
• Easier access
• Protected installation

The building itself must still provide appropriate ventilation, clearances, drainage, and environmental conditions.

Outdoor 24kV Switchgear

Outdoor equipment must be designed for the expected environmental conditions.

Consider:

• Temperature
• Humidity
• Rain
• Dust
• Pollution
• Solar radiation
• Corrosive atmosphere

The enclosure and equipment protection ratings should be reviewed before selection.

How to Select 24kV Switchgear

1. Confirm the System Voltage

Determine the network’s nominal and maximum voltage.

Then verify that the equipment’s rated voltage and insulation level are appropriate.

2. Calculate the Load

Determine the expected continuous current for each feeder.

Include reasonable consideration for future expansion.

3. Determine the Fault Level

The available short-circuit current is critical for selecting the circuit breaker and switchgear assembly.

A protection study should establish the required fault ratings.

4. Select the Circuit Breaker

For many modern MV applications, vacuum circuit breakers are an attractive option.

Review:

• Rated current
• Short-circuit breaking current
• Mechanical endurance
• Electrical endurance
• Operating mechanism
• Protection interface

5. Define the Busbar Requirements

Check:

• Rated current
• Short-time withstand
• Peak withstand
• Insulation
• Bus-section configuration

6. Define Arc-Resistance Requirements

If personnel can access areas around energized switchgear, determine whether an IAC classification is required.

Specify the desired accessibility and test conditions.

7. Consider the Installation Environment

Define whether the equipment will be:

• Indoor
• Outdoor
• Coastal
• High altitude
• High humidity
• High pollution
• High temperature

8. Request Technical Documentation

A professional supplier should be able to provide relevant documentation such as:

• General arrangement drawings
• Single-line diagrams
• Technical datasheets
• Type-test documentation
• Routine-test information
• Installation manuals
• Maintenance manuals

24kV Switchgear for Renewable Energy

Renewable energy is creating increasing demand for medium-voltage power distribution equipment.

Solar

Solar farms can use 24kV-class switchgear in collector systems where the electrical design requires this voltage class.

The switchgear can connect transformer stations to collector feeders and the main substation.

Wind

Wind farms can use medium-voltage switchgear to collect power from multiple turbine transformers.

Remote access makes equipment reliability and maintenance requirements particularly important.

Energy Storage

Battery storage projects can use medium-voltage switchgear between power conversion equipment and the grid connection.

Protection coordination is especially important because the electrical characteristics of inverter-based systems can differ from conventional generation.

Maintenance of 24kV Switchgear

Maintenance requirements vary by product design.

Vacuum-based and sealed switchgear can reduce certain routine maintenance requirements, but no switchgear should be assumed to require zero maintenance without reviewing the manufacturer’s documentation.

Maintenance programs may include:

• Visual inspection
• Circuit breaker checks
• Protection relay testing
• Interlock checks
• Connection inspection
• Insulation assessment
• Functional testing

Environmental conditions can also affect maintenance requirements.

A product installed in a clean indoor electrical room may have different requirements from equipment installed in a dusty, humid, or corrosive environment.

Frequently Asked Questions

What is 24kV switchgear?

24kV switchgear is medium-voltage electrical equipment designed for power distribution systems requiring a 24kV-class rated voltage. It can include circuit breakers, busbars, disconnectors, earthing switches, protection devices, and control equipment.

What is 24kV switchgear used for?

It can be used for utility distribution, industrial substations, transformer protection, solar farms, wind farms, battery energy storage, and commercial or infrastructure power systems.

Is 24kV switchgear the same as 24kV VCB?

No. A 24kV VCB is a vacuum circuit breaker, while 24kV switchgear is the complete assembly that may contain the circuit breaker plus busbars, compartments, protection equipment, cables, interlocks, and other components.

What circuit breaker is commonly used in 24kV switchgear?

Vacuum circuit breakers are widely used in modern medium-voltage switchgear. The appropriate breaker should be selected according to the system’s voltage, current, fault level, and switching requirements.

Can 24kV switchgear be SF6-free?

Yes. Depending on the design, 24kV-class switchgear can use vacuum interruption combined with air or solid insulation and other technologies that avoid SF6.

Is 24kV switchgear suitable for solar farms?

It can be suitable when the collector network’s voltage, fault level, insulation requirements, and environmental conditions match the equipment specifications.

Does 24kV switchgear need internal arc protection?

Not every installation has the same requirement. The need for internal arc classification depends on the project design, personnel access, applicable standards, and safety requirements.

What standards apply to 24kV switchgear?

Applicable standards depend on the equipment type and project. Relevant parts of the IEC 62271 series are commonly used for medium-voltage switchgear and controlgear.

How do I choose a 24kV switchgear manufacturer?

Compare electrical ratings, IEC documentation, type-test evidence, internal arc capability where required, customization options, production quality, delivery capability, spare parts, technical support, and experience with similar projects.

Conclusion

24kV switchgear is an important medium-voltage solution for utility, industrial, commercial, and renewable energy power distribution.

Selecting the right product requires more than checking the voltage rating. Buyers should evaluate rated current, short-circuit performance, insulation level, circuit breaker technology, busbar configuration, internal arc requirements, environmental conditions, standards, and lifecycle support.

For distributors and EPC contractors, a detailed technical specification makes it easier to compare manufacturers and avoid equipment that does not match the project’s actual requirements.

For modern projects, 24kV vacuum circuit breaker switchgear, solid insulated switchgear, compact RMUs, and other SF6-free configurations can provide different approaches depending on the electrical system and application.