Inrush current

（重定向自Surge current）

An example of an inrush current transient during a 100VA toroid transformer energization. Inrush peak circa 50 times of nominal current.

Inrush current, input surge current or switch-on surge is the maximum, instantaneous input current drawn by an electrical device when first turned on. Alternating current electric motors and transformers may draw several times their normal full-load current when first energized, for a few cycles of the input waveform. Power converters also often have inrush currents much higher than their steady state currents, due to the charging current of the input capacitance. The selection of overcurrent protection devices such as fuses and circuit breakers is made more complicated when high inrush currents must be tolerated. The overcurrent protection must react quickly to overload or short circuit faults but must not interrupt the circuit when the (usually harmless) inrush current flows.

单词	Surge current
释义	Surge current 原声例句《环球时报》阅读精选 However, that alone doesn't fully explain Harbin's current surge in popularity and reputation. 然而，仅凭这一点并不能完全解释哈尔滨目前人气和声誉的飙升。新奇事件簿 It said the introduction of a " Temporary Basic Income" for the world's poorest people could slow the current surge in coronavirus cases. 其表示实施世界最贫困人群“临时基本收入 ”计划可以减缓当下新冠病例的激增。英语百科 Inrush current （重定向自Surge current） Inrush current, input surge current or switch-on surge is the maximum, instantaneous input current drawn by an electrical device when first turned on. Alternating current electric motors and transformers may draw several times their normal full-load current when first energized, for a few cycles of the input waveform. Power converters also often have inrush currents much higher than their steady state currents, due to the charging current of the input capacitance. The selection of overcurrent protection devices such as fuses and circuit breakers is made more complicated when high inrush currents must be tolerated. The overcurrent protection must react quickly to overload or short circuit faults but must not interrupt the circuit when the (usually harmless) inrush current flows.
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