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13. 05. 2026

Static load transfer switches and distribution equipment in critical infrastructure: the benefits of an integrated solution

For critical infrastructure facilities, uninterrupted power supply is one of the key requirements for stable operation. Data centers, medical facilities, industrial enterprises, and research centers are operating under increasing workloads, stricter requirements for operational continuity, and the need to scale their infrastructure. That is why more and more organizations are transitioning to architectures that combine redundancy, flexibility, and a clear logic for power system design.

One such approach is the integration of static transfer switches (STS) into power distribution units. In Vertiv solutions, this role is performed by the Vertiv Liebert STS2—a static transfer switch designed for systems with two independent power sources in a two-bus power architecture. Its task is to automatically and virtually seamlessly switch the load between power sources in the event of deviations, ensuring stable equipment operation.

Why the integration of a static load switch and a distribution device matters

When an STS is part of a power distribution system, the customer receives not just a standalone device, but a comprehensive solution. Distribution devices are responsible for protecting and distributing electrical power, while the STS handles rapid, automatic switching between independent power sources. Together, they form a reliable and logically organized power supply system for mission-critical loads.

1. Higher level of redundancy

STS integration allows for the use of two independent inputs (A and B) and automatically switches the load in the event of a problem with one of the sources. For facilities where even a brief power outage results in financial or operational losses, this is critically important. This solution also makes it easier to scale the power system as the facility’s infrastructure expands.
In fact, the customer receives not just an additional redundancy element, but an architecture in which fault tolerance is built in at the system level.

2. Simpler architecture and scalability

Implementing STS helps simplify the design of power distribution systems—especially during infrastructure upgrades or phased expansion.

Vertiv Liebert STS2 units are available in ratings from 100A to 1850A and feature:
• front access for maintenance
• compact design
• seamless integration with circuit breakers
• a color touchscreen display and an integrated WEB-SNMP monitoring card

This allows you to:
• reduce design complexity
• simplify documentation
• integrate equipment into monitoring/dispatching systems
• scale the system more easily in the future

For the customer, this means fewer risks during expansion and lower costs for changes in the long term.

3. More convenient service and fewer risks

In mission-critical systems, it is important not only to avoid failures but also to perform maintenance quickly and safely.
The Liebert STS2 is equipped with a user-friendly control interface that simplifies diagnostics and configuration. A clear separation of power sources A and B helps reduce the likelihood of human error.

Additionally, internal sectioning (Form 4B) is used in the distribution units—this means that different functional parts of the system are physically separated from one another.

In practice, this results in:
• greater safety during maintenance
• lower risk of emergencies
• predictable system operation

4. Where does this have the greatest impact?

The use of STS and distribution devices is particularly effective for:
• data centers, especially for supporting AI—dual-bus systems, high dynamic loads, and phased expansion
• medical facilities — life-critical equipment
• industry and laboratories — sensitive automation systems

It is precisely under these conditions that the difference between fragmented solutions and a comprehensive power supply system is most noticeable.

Conclusion

The Vertiv Liebert STS2 with distribution units is not just a combination of two types of equipment, but a strategic approach to building a reliable infrastructure.
It allows you to:
• improve fault tolerance
• simplify the system
• reduce operational risks.
For facilities where operational continuity is critical, this creates the foundation for stable growth.

If your company is planning to modernize or expand its infrastructure, it is important to consider STS not in isolation, but as part of a comprehensive solution alongside distribution devices, UPSs, and monitoring systems. This approach ensures not only reliability but also the long-term manageability of the entire system.

Source

https://www.vertiv.com/en-emea/about/news-and-insights/articles/blog-posts/2026/how-integrating-switchgear-with-vertiv-liebert-sts2-static-transfer-switch-simplifies-power-architectures-and-elevates-redundancy/

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