Question

What is Clamping Voltage?

Answer

Clamping voltage is the maximum voltage allowed to pass through the circuitry to the connected equipment when tested with the UL test surge. 330 volts is the lowest rating allowed by the UL and the rating must be stated on the unit. The lower the number, the better. Other allowed ratings are 400, 600, 800, and 1000. Some manufacturers use a rating called "let through voltage" to present appearances of superior performance, but UL does not validate this terminology.

Was this document helpful?

Yes No Need to try first

Give us your feedback on this FAQ. What could we have done to to answer your question better?