Jännitepalautumisen
Jännitepalautuminen, a Finnish term, translates to "voltage recovery" or "restrike" in English, particularly in the context of electrical circuits. It refers to the phenomenon where voltage reappears across the contacts of a circuit breaker or switch after it has been opened, especially during the interruption of an electrical current. This voltage reappearance can be transient or sustained and poses a significant challenge in achieving successful current interruption.
When a circuit breaker opens, an arc is formed as the contacts separate, carrying the electrical current.
If this transient voltage exceeds the dielectric strength of the gap between the contacts, a restrike occurs,