what is the difference in rating specifications between Joules and surge current protection?

Joule, J/V a unit of electrical energy equal to the work done when a current of 1 ampere passes through a resistance of one ohm for 1 second.

Euro and others use Joule to measure electrical current. The US and others use Amperage to measure current. Both are valid measurement types.

Hello, Joule ratings are not a recognized indication of protection and not an accurate rating of performance. In the surge protection industry the proper means of determining the protection level is the kA rating, Peak Current Rating (Maximum Current Rating) is the most current that the MOV device can handle without suffering irreversible damage. Regards.