“What is the clamping voltage? Anything greater than 400 V is inadequate protection. Usually when they don’t state that specification, it’s because they’re ashamed of the number.”

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• The clamping voltage is 400V.

  Answered by InsigniaCustomerSupport 4 years ago

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• Clamping voltage, also referred to as let through voltage or the Voltage Protection Rating (VPR), is the amount of voltage a surge protector permits to pass through it to the attached load (ex: a TV) during a surge event. ... The clamping voltage is 600V.

  Answered by Grymereaper 4 years ago

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