Where and why are isolation transformers used?

Johnson Electric Coil Company
An autotransformer can be a remarkably efficient and versatile solution, particularly when the ratio of voltage transformation between input and output is low. Advantages of weight and overall size typically yield a lower cost design than an isolation transformer designed to the same electrical parameters.

In contrast, the isolation transformer, by its very nature, affords a degree of electrical safety/protection to people and equipment alike that the autotransformer cannot provide. And, unlike an autotransformer, an isolation transformer can accommodate an electrostatic shield between input and output, which a) prevents electrical noise on the load side from filtering back onto the line side, b) provides an additional degree of isolation between input and output windings, and c) can provide for an electrical path to ground, or protective earthing, in the event of a fault. Isolation transformers, like autotransformers, can be used to create a step up or step down. The isolation transformer can also mitigate potentially damaging effects of poor power quality on sensitive equipment over time.

Our engineering team will help you determine which type—isolation or autotransformer—is best suited to your unique application. Call us at 715.627.4367.

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