瞬时动作 meaning in English

immediate activate
split second response
split-second response

In general conditions , only up limit is taken into account for instantaneous trip
一般情况下瞬时动作值只考核上限。
For the breakers with abjustable instantaneous tripping characteristics , the tripping current is shown in the following tables with tolerance of 20 separately , please note when ordering
瞬时动作特性可调的断路器其动作电流如下表动作电流误差为20 ，订货时请注明。
The tripping device is basically divided into the instantaneous electromagnetic release and the time delay thermal release , which are used for protection of circuit from shortcircuit and overload respectively
断路器由瞬时动作的电磁脱扣器和延时动作的热脱扣器组成，分别用作线路的短路和过载保护。