The rated peak withstand current (dynamic stability) of a high-voltage circuit breaker refers to the first half-wave current peak value of the rated short-term withstand current that the circuit breaker can carry under the specified use and performance conditions at the closing position. The duration of the short-term withstand current shall not be less than 0.3s. The standard value of the rated peak withstand current is equal to 2.5 times the rated short-time withstand current, and also equal to the rated short-circuit making current (peak). It reflects the maximum instantaneous value (peak value) of the short-circuit current that can pass when the circuit breaker is closed (or can pass when closed) that will not prevent the circuit breaker from continuing to work normally. This current is also called limit passing current. The size of the limit passing current reflects the ability of the circuit breaker to withstand the electromotive force caused by the short-circuit current.