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    Electrical Unit Substations

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    Electrical Unit Substations

    What is an electrical substation?

    Designed for commercial and industrial applications, unit substations are composed of one or more transformers combined with one or more switchgear or switchboard configurations to convert distribution voltages to utilization voltages. They are available in single-phase or three-phase, and can be used indoors or outdoors, with dry-type unit substations being the most popular choice for outdoor use.

    The main function of a unit substation is to locate the transformer closest to the highest concentration of power, thus reducing the chance of faults and improving efficiency. However not all unit substations are created equal, and just like other transformers and electrical supply hardware, there are different types specifically designed for different applications.

    Choosing your electrical unit substation.

    Whether low voltage or medium voltage, electrical unit substations use a variety of mechanisms to get the job done. VPE transformer coils are silicone-treated to withstand the most common outdoor conditions (rain, wind, etc.), while VPI transformer coils are treated with a high temperature polyester varnish to withstand common indoor industrial conditions like moisture, dirt and dust. Cast coil transformers, however, are designed to meet extremely high electrical demands to withstand even the most extreme of conditions, and are most commonly used in the heaviest of industrial applications.

    Same-day shipping available
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    1-year Warranty

    Bay Power: Your source for electrical unit substations.

    Bay Power boasts an impressive inventory including a wide variety of low and medium voltage electrical unit substations of various constructions, including vacuum pressure impregnated (VPI), vacuum pressure encapsulated (VPE), and cast coil varieties. Ask about our selection of electrical unit substations, ranging from 600V to 5000V ratings.

    Request a Quote

    Please fill in the following information or contact us at (800) 699-2980 to request a free quote. Our friendly sales staff would be glad to assist you!

    Why Bay Power

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    Sell to Us

    Fill your wallet, not the landfill.

    Have any old or unused Electrical Unit Substations lying around? Don’t get rid of them just yet. While we stock a wide range of quality electrical products and solutions, both new and reconditioned, we also buy back your unwanted equipment. So, before deciding what to do with your old Electrical Unit Substations and components, have one of our expert technicians take a look to see if we can save a few parts, save the environment, and save you some cash.

    Sell to Us



    Great service shouldn’t end after the purchase. We pride ourselves on the relationships we build with our customer-first mentality and the quality of our Electrical Unit Substations and components. That’s why we offer a 1-year replacement warranty on all of our electrical products and solutions from the top manufacturers. Because when you buy with Bay Power, you buy with confidence.

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    Product Condition FAQ

    We are proud to stock a variety of competitively priced, new and reconditioned components from the leading manufacturers of Electrical Unit Substations.


    Thanks to our extensive inventory of Electrical Unit Substations and components, our resourceful and expertly trained staff will always be able to get the products that you need. Through our extensive network of suppliers, we are able to carry and acquire a huge variety of electrical products and solutions, so chances are if you need it, we can get it.


    Bay Power’s priority is providing you with reliable, high quality electrical hardware. That’s why our mission is to make sure our reconditioned electrical products and solutions function as perfectly as the day they were built. Because while the quality is high, the cost of Electrical Unit Substations shouldn’t be.

    New Surplus

    Our selection of new surplus Electrical Unit Substations may not arrive brand new in a box, but they function just as well, and have never had electricity run through them. All of the quality, none of the packaging, always with our 1-year replacement warranty.