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Is there a grounded version of the Stetzerizer filter?

No, we do not make a grounded (3-prong) version of the North American STETZERiZER filter. Why not? To put it simply, there is no need. STETZERiZER filters act as a short to high frequencies, and since current oscillates on the hot and neutral wires of the electrical system, it is appropriate to short the hot to the neutral with the filter in order to neutralize these high frequencies. The National Electrical Code (NEC) in the United States mandates that the neutral and grounding conductors be bonded at the main service panel; with the neutral and ground bonded, Stetzer filters will therefore short out high frequencies on the grounding conductor as well.

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