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What is Unclamped Inductive Switching (UIS)?

inductive switching UIs
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What is Unclamped Inductive Switching (UIS)?

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Whenever current through an inductance is quickly turned off, the magnetic field induces a counter electromagnetic force (CEMF) that can build up surprisingly high potentials across the switch. With transistor switches, the full buildup of this induced potential may far exceed the rated voltage breakdown of the transistor, resulting in catastrophic failure.

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