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Utilities have used oil-insulated switchgear for decades. But times change.

The modern grid continues to evolve. Sustainability pressures continue to mount.

It’s time for a new approach. It’s time for S&C’s Vista® Underground Distribution Switchgear.

Product Overview

green pad-mounted underground distribution switchgear

Vista Underground Distribution Switchgear

Vista switchgear solves difficult switching and protection challenges and improves reliability using SF6 insulating gas. Built with the user in mind, it only takes one person to operate, and includes other features designed for operator safety, such as highly visible gaps.

Vista Green Unit

Vista Green Underground Distribution Switchgear

Vista Green switchgear provides the same features, design, and reliability benefits of Vista switchgear without the SF6 gas. This alternative instead uses a hermetically sealed CO2 mix that reduces its global warming potential by 97% compared to SF6 switchgear.

 Zero emissions solid dielectric pad, live front switchgear, zero emissions, solid dielectric, vault mounted

Vista SD Underground Distribution Switchgear

Vista SD switchgear is another eco-friendly option that uses solid-dielectric material instead of an insulating gas. With its highly visible breaks, flexible design, and front-facing terminations, this switchgear is particularly advantageous in vault applications and at higher altitudes.


Vista, Vista Green, and Vista SD switchgear are built to minimize reliability risks and deliver significant cost savings.

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Withstands harsh environments

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Fully submersible, sealed, and protected

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Reduces maintenance costs

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Improves reliability over oil-insulated switchgear

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Certified arc-resistant*

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Simple operation

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No fuse handling

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Green insulation technology**

*Applies to Vista and Vista Green switchgear only.
**Applies to Vista Green and Vista SD switchgear only.

Construction & Design

Explore the construction and key features of this product using the 3D product viewer below. For instructions on how to use the viewer, click the Help button next to the black question mark icon.


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Green Insulation Technology

Insulation has drastically reduced or zero global-warming potential.*

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Manual or Automatic

Choose automatic, manual, or remote operational capabilities with a motor operator.

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Dust, Corrosion & Leak-Proof

Prevent leaking, rusting, or contamination to switchgear with a sealed design.

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Smaller Footprint

The switchgear's compact, low-profile design minimizes footprint.

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Visible Open Gap

Easily confirm closed, open, and grounded** positions through large viewing windows.

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Multiple Installation Styles

Choose from pad-mounted, vault-mounted, single-way wind-turbine**, or UnderCoverTM style** units.

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No External Grounds

Ground medium-voltage cables using a standard internal ground switch. External grounds are not required.**

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Low Maintenance

Minimal mechanical maintenance is required once a unit is installed; only an annual visual inspection is recommended.

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Overcurrent Control

Superior coordination, flexibility, and reliability are made possible with a self-powered and user-friendly control.

Why Go Green?

The same features. The same design and benefits. No SF6. A 97%-reduced global warming potential.

Explore the sustainable power of Vista Green switchgear


Vista® and Vista® SD Underground Distribution Switchgear for Utilities: Improves reliability and safety while reducing maintenance costs

Are you considering alternatives to oil-insulated switchgear? The guidebook summarizes how making the switch from oil-insulated switchgear to Vista, Vista Green, or Vista SD switchgear can be advantageous from an operational and maintenance standpoint.

View or Download PDF

Vista® and Vista® SD Underground Distribution Switchgear for Utilities: Improves reliability and safety while reducing maintenance costs

As the grid becomes more complex, utilities are facing a variety of challenges pressuring them to reassess their medium-voltage switchgear. In fact, some switchgear even poses risks that increase operation and maintenance (O&M) expenses while reducing reliability. As utilities reevaluate the switchgear on their system, they importantly should consider the scope of the challenges they may face and the breadth of switchgear products available that can best meet the needs of today’s grid.

View or Download PDF

Case Studies

Customer successes achieved using Vista, Vista Green, or Vista SD switchgear.

West Coast Utility

Improved reliability and perfect coordination, while use of UnderCover Style units makes switchgear virtually invisible in the community.

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Midwest Utility

Improved reliability, while sectionalizing and coordination are provided with the existing scheme.

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Arizona Utility

Utility standardizes Vista switchgear on its system after this project’s success.

Read More

*Applies to Vista Green and Vista SD switchgear only.
**Applies to Vista switchgear only.

Product Details

Vista OCC

Vista, Vista Green, and Vista SD switchgear are furnished with fault-interrupter ways includes a unique microprocessor-based overcurrent control that detects faults and initiates operation of the resettable fault interrupters. Program the control in the shop or in the field using your personal computer via an easily connected USB port. The control offers exceptional flexibility and reliability, and it includes features unavailable in other manufacturers’ devices—or only available at substantial extra cost:

  • Five families of curves: Standard “E,” “K,” and “T” speed curves are supported plus special customizable “coordinating-speed” tap and main curves.
  • Superior coordination with upstream protective devices and downstream power fuses: Coordinating-speed curves provide optimal coordination on underground distribution systems.
  • Custom curve attributes: Coordinating-speed curves can be easily modified to include two separate definite-time delays.
  • Separate phase and ground curves are standard: This enables better coordination with source-side breaker trip settings. Negative sequence and sensitive earth fault protection settings are also provided.
  • No extra “wake-up” time: If a fault-interrupter way is closed into a fault, the fault interrupter will trip and clear the fault per the selected TCC, with no additional delay.
  • Self-powered: Current transformers on fault-interrupter ways provide sensing and power. No batteries or battery maintenance is needed.
  • Simple and straightforward programming and access to status information: All programming software is stored in the control. Programming is completed via a browser-based user interface.
  • Event log: The log captures information on the last 64 events captured by the control.
  • Diagnostic information: Data is available to assess the status of the control.
  • Optional external trip provisions for additional functionality: Input from external sources such as transformer sudden-pressure relays can also trip the fault interrupters.



Contact us today to learn more.

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