What is high voltage (HV) switchgear and why is it important?

HV switchgear is a combination of electrical disconnects, fuses, circuit breakers, and relays designed to monitor, control, and protect high-voltage circuits. It is essential for safe, reliable, and efficient power transmission and distribution.

How often should HV switchgear and breakers be maintained?

Maintenance should follow manufacturer recommendations at a minimum. For critical assets, Siemens Energy recommends proactive, condition-based maintenance to minimize downtime and extend equipment lifespan.

What are the main causes of failure in HV switchgear and breakers?

Common causes include aging components, insulation breakdown, SF6 gas leaks, mechanical wear, and environmental factors such as humidity and corrosion. Predictive diagnostics and regular inspections help prevent failures.

What is the impact of a switchgear or breaker failure?

A single outage event can cost up to $850K and result in over 261 hours of downtime. Proactive lifecycle management and Long Term Service Programs (LTSP) from Siemens Energy help mitigate these risks.

How does Siemens Energy support environmental compliance?

Siemens Energy offers SF6-free retrofits and eco-friendly upgrades to help customers meet phaseout mandates and reduce environmental impact.

Can Siemens Energy help with aging assets?

Yes. For assets over 40 years old, Siemens Energy provides life extension, modernization, and replacement planning to ensure continued reliability and compliance.

High-voltage product services

High voltage (HV) product services, specializing in switchgear and circuit breakers, form the backbone of electrical power transmission and distribution systems. Reliable switchgear and breakers are the foundation of safe, efficient, and sustainable power delivery.

Whether your assets have surpassed their warranty period or require proactive management to minimize downtime and extend lifespan, Siemens Energy provides tailored power transmission service solutions that optimize performance and enhance grid stability. “With decades of innovation and over 2,000 dedicated professionals worldwide, Siemens Energy ensures the safety, reliability, and efficiency of your high voltage infrastructure—at every stage of its lifecycle.

Failure costs: Up to $850K per outage event, 261+ hours downtime on average.
Asset age: 40+ years requires urgent life extension or replacements.
Availability: Proactive lifecycle management raises uptime to >99%.
Environmental compliance: SF6 phaseout mandates retrofit or replacement.
Technical innovation: Artificial Intelligence (AI) and digital enablement reduce failure risk & cost.
Strategic partnership: Long Term Service Programs build long-term collaboration with customers, aligning service delivery with operational goals and ensuring sustained asset performance.

Siemens Energy helps utilities and industries avoid costly outages—up to $850K per event—by extending switchgear and breaker life and boosting uptime to over 99%. Our SF6-free retrofits and AI-powered diagnostics ensure compliance, reliability, and future-ready performance.

Key features and benefits:

Precision Installation. Expert installation of high-voltage switchgear and circuit breakers, fully compliant with OEM standards and customized for site-specific requirements.
Comprehensive Commissioning. End-to-end commissioning with performance validation reports, ensuring your electrical infrastructure meets reliability and safety benchmarks.
Operator & Maintenance Training. Hands-on training for operators and maintenance teams on safe handling, operational protocols, and preventive maintenance for HV equipment.
Proactive Risk Mitigation.
Advanced fault detection and system alignment to minimize downtime and extend the life of your switchgear and breakers.

Delivered by certified field engineers and technicians, our services ensure every transformer and HV component is energized safely and efficiently—providing a robust foundation for grid reliability and uninterrupted power supply.

Key features and benefits:

Upgrades & Retrofits - Replace outdated components with OEM-approved parts.
Refurbishment – Restore aging equipment to optimal condition.
Digital Integration – Add smart monitoring for early fault detection.
Capacity Extensions (Adapter Versions) – Expand systems seamlessly for future load demands.
Compliance & Safety – Meet latest standards and reduce risk.

Key features and benefits:

Preventive maintenance plans to extend transformer lifespan and reduce failure risk
Diagnostic testing and condition monitoring for early fault detection
Flexible service levels ranging from basic inspections to full overhauls and upgrades
Rapid response and expert troubleshooting for emergency repairs
Training modules for operators and maintenance teams on safety and best practices

These programs offer predictable service costs, improved asset reliability, and peace of mind—especially for operators managing large transformer fleets or critical infrastructure.

Siemens Energy’s portfolio uniquely incorporates:

Zero Global Warming Potential (GWP) alternatives replacing traditional SF6 insulation in switchgear
Eco-friendly vacuum circuit breakers with long-term reliability and reduced environmental impact
Digital platforms for predictive maintenance using IoT sensors, AI, and cloud analytics
Cybersecurity frameworks safeguarding critical grid control systems

These sustainability-driven innovations align with global decarbonization targets and future-proof infrastructure investments.

Key features and benefits:

Genuine OEM Spare Parts
Access a full range of certified components for high-voltage switchgear and circuit breakers, guaranteeing compatibility and reliability.
Smart Spares Consulting
We analyze your operational needs and recommend strategic spare parts planning - helping you maintain optimal stock levels, avoid overinvestment, and ensure critical parts are always available.
Lifecycle Support
From initial installation to modernization, we provide spare parts tailored to every stage of your equipment’s lifecycle.
Fast delivery and global availability
Minimize downtime with rapid dispatch and worldwide logistics support.

OEM expertise and original spare parts ensuring quality and compatibility
Lifecycle-spanning service coverage optimizing asset uptime and operational efficiency
Proactive, data-driven maintenance reducing failures and extending equipment lifespans
Flexible Long Term Service contracts tailored to specific asset portfolios and business objectives
Commitment to environmental sustainability and innovation

Discover how Axia Energia (formerly known as Eletrobras Chesf) partnered with Siemens Energy to transform Brazil’s transmission network. From replacing over 1,000 components across 40 substations to boosting energy efficiency and ensuring reliable power for millions—this is one of the largest retrofit projects in the country’s history.

See how modernization sets new standards for grid performance.

Your direct connection to the existing transmission grid.

Siemens Energy provides customized Micro substation for remote areas, offering sustainable and environmentally friendly electricity solutions with virtually unlimited power availability. These substations are ideal for rural areas with high power demands.
Electricity accessibility through tailor made solution to overcome different applications such as electrifying remote areas by a direct connection from the existing transmission grid. One step from high voltage to low voltage.

Since 2002, Siemens Energy has been awarded preventive maintenance contracts for more than 80 high-voltage substations in Kuwait. Siemens Energy delivers original manufacturer expertise, products, and consultancy, for example, for maintaining power and station transformers, gas-insulated switchgear, as well as GIS and air-insulated switchgear. The integrated solution, provided by a single source, is based on OEM expertise for installed assets and ensures the availability of the transmission and distribution system.

UW Mecklar GIS (08/2018) Montage GIS und Aussenanlagen Umspannwerk

Curious about Substations?

Infrastructure facilities, industries, and private households globally are increasingly demanding electrical energy. High-voltage substations, pivotal in today's intricate power transmission infrastructure, are crucial for fulfilling this need both safely and dependably. Siemens Energy stands as a dependable ally for the planning and construction of bespoke, cutting-edge high-voltage substations, no matter your location.

Curious about Blue GIS?

The energy sector's high carbon impact necessitates urgent decarbonization to combat climate change. At Siemens Energy, we prioritize achieving Zero Global Warming Potential (GWP) in power transmission and generation. Our Zero-harm Blue portfolio offers sustainable alternatives to SF6-insulated switchgear and busduct, addressing the environmental impact of current practices.

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High Voltage Services for Switchgear and Breakers

Importance and Need for Services on High Voltage Equipment

High Voltage Services for Switchgear and Breakers

Long Term Service Programs

Cutting-Edge High-Voltage Technologies and Sustainability

Why Siemens Energy for HV Switchgear and breakers

Proven Track Record and Global Expertise

Modernizing Brazil’s Power Grid: A Landmark in Efficiency and Reliability

Special offering: Micro substation

Your direct connection to the existing transmission grid.

Why maintenance?

Mircro substation

Blue retrofit

Maintenance of multiple substations

Modernization of an existing substation

Service program for energy infrastructure

Curious about Substations?

Curious about Blue GIS?

Get in touch with us

Get answers: FAQs on HV Switchgear and Breakers Services

High Voltage Services for Switchgear and Breakers

Importance and Need for Services on High Voltage Equipment

High Voltage Services for Switchgear and Breakers

Long Term Service Programs

Cutting-Edge High-Voltage Technologies and Sustainability

Why Siemens Energy for HV Switchgear and breakers

Proven Track Record and Global Expertise

Modernizing Brazil’s Power Grid: A Landmark in Efficiency and Reliability

Special offering: Micro substation

Why maintenance?

Mircro substation

Blue retrofit

Maintenance of multiple substations

Modernization of an existing substation

Service program for energy infrastructure

Get in touch with us

What is high voltage (HV) switchgear and why is it important?

How often should HV switchgear and breakers be maintained?

What are the main causes of failure in HV switchgear and breakers?

What is the impact of a switchgear or breaker failure?

How does Siemens Energy support environmental compliance?

Can Siemens Energy help with aging assets?

References