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.

Certified experts install switchgear, circuit breakers, and transformers—fully OEM-compliant and tailored to site needs.
Complete HV commissioning with performance validation for maximum safety and reliability.
HV Training
Hands-on operator and maintenance training for safe handling, operational protocols, and preventive maintenance.
Risk Mitigation
Advanced fault detection, system alignment, and predictive maintenance to reduce downtime and extend equipment life.
Our field engineers ensure safe energization of high-voltage components, delivering grid reliability and uninterrupted power supply.

Modifications & Modernizations
Adapt existing substations to meet current grid requirements and improve safety: Substation modernization, Bay layout modifications, Refurbishment & retrofit.
Upgrades & Uprates
Boost technical performance to align with evolving grid standards: Increase nominal current and short-circuit current ratings & Update technical specifications to support grid transformation and higher capacity demands.
Extensions
Expand substation capacity without full replacement: Add GIS bays using the same product family for seamless integration or use adapter modules to extend compatibility with any existing GIS type or brand, enabling flexible expansion.

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.

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.

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.

Brazil Power Grid Modernization with HV Switchgear and Circuit Breakers
Siemens Energy partnered with AXIAEnergia (formerly known as Eletrobras Chesf) to upgrade Brazil’s transmission network, replacing nearly 1,000 outdated components—including high-voltage switchgear and circuit breakers—across 40 substations. This modernization project enhances grid reliability, improves operational efficiency, and ensures a secure energy supply for millions. Discover how advanced HV solutions drive resilient, future-ready power systems.

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

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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.

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.

High Voltage Services for Switchgear and Breakers

Importance and need for services on high voltage equipment

High voltage services for switchgear and breakers

Consultancy and advisory services

Installation and commissioning

Repair and maintenance

Modernization and upgrade solutions

Spare parts

Service programs

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