ferrite toroid
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Industrial Control Isolating Toroidal Transformer
Toroidal isolation transformer: Safety -- the secondary of the isolation transformer is not connected with the earth, and the toroidal isolation transformer's output is "floating ground". When people touch any line of the secondary of the isolation transformer, they will not get electric shock because they cannot form a current loop. Prevent power electronic devices from polluting the power grid - transformers have a great attenuation effect on high-frequency harmonics, so power electronic devices can avoid polluting the power grid.
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