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    Oil & Liquid-Filled Transformers

    Looking for Oil & Liquid-Filled Transformers? Get a quote fast.

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    When dry-type transformers just don’t cut it.

    Liquid-filled and oil-filled transformers are commonly coupled with other incoming or outgoing equipment to lower the utility voltage. They’re used for a variety of industrial and commercial applications and can be used both indoors and outdoors. Liquid-filled transformers are three-phase transformers that are used across both commercial and industrial applications including mining, automotive, and assembly line machinery. They are built to withstand harsh conditions and heavy loads, all while maintaining structural, electrical and mechanical integrity.

    Liquid-filled and oil transformers tend to be the less expensive choice when used for outdoor applications. Also, while dry-type transformers have many advantages, they are limited by voltage rating and size. Liquid-filled transformers can handle much larger electrical loads and are available in higher voltage ratings as well.

    Mineral oil, silicone, fire-resistant hydrocarbon fluid. Take your pick.

    Liquid filled transformers can be filled with a variety of liquids with mineral oil being the most common choice for outdoor use, though oil filled transformers can be used indoors if enclosed in a vault. There are also many other environmentally friendly, industry standard-compliant liquids like R-Temp®, silicone, BIOTEMP®, and fire-resistant hydrocarbon fluid, just to name a few. All of these liquids are good options, but knowing your budget and where and how you will install your transformer will be able to better guide you in your choice of liquid.

    For example, mineral oil is durable, tends to be the least expensive, and would make for a good outdoor liquid. Fire-resistant hydrocarbon fluid (FRHF) is far less flammable than other liquids, is non-toxic and readily biodegradable, and can be safely used indoors. Not to mention it can extend the life of your transformer’s insulation. Silicone is a good option for both indoor and outdoor use, and has a low-flammability and low-toxicity rating. However there are always flammability concerns of some degree, as well as cleanup concerns, which can become costly.

    Same-day shipping available
    24-hour emergency support
    Global supplier network
    1-year Warranty

    Look no further than Bay Power for oil and liquid filled transformers.

    From industrial oil filled transformers to commercial liquid filled transformers, Bay Power is the only transformer supplier you’ll need. We carry only the best transformers in the business from top transformer manufacturers to ensure you get the highest level of both quality and performance.

    Choose from our vast selection of oil and liquid filled transformers today. Take advantage of our expert service to find the transformer that's right for you.

    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 Oil & Liquid-Filled Transformers 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 Oil & Liquid-Filled Transformers 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 Oil & Liquid-Filled Transformers 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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    Buying Options

    Product Condition FAQ

    We are proud to stock a variety of competitively priced, new and reconditioned components from the leading manufacturers of Oil & Liquid-Filled Transformers.


    Thanks to our extensive inventory of Oil & Liquid-Filled Transformers 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 Oil & Liquid-Filled Transformers shouldn’t be.

    New Surplus

    Our selection of new surplus Oil & Liquid-Filled Transformers 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.