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A 3 heat switch enables two elements for example of 1kw, to give out 100% power, 50% power and finally 25%.

That equates to two 1kw elements in parallel. (100%)

One 1kw element on power only. (50%)

And finally both 1kw elements in series. (25%)

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Q: What is the application of 3-heat switch control in electrical?
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