Inrush current
Inschakelstroom (inrush)
Also known as: spanningsdip-motorstart, startstroom-netimpedantie, voltage-dip-asynchroon
A brief current peak when switching on a load, often a multiple of rated current: transformers and motors up to 8-12 × In, LED drivers and SMPS up to 20-60 × In for a few milliseconds due to input-capacitor charging. Drives the MCB curve choice (B/C/D) so the breaker does not trip on every switch-on.
Practical example
Inrush current: A 400 V motor with 10 A rated current draws 80-120 A momentarily upon direct switching, justifying a Type D circuit breaker.
Common mistake
Inrush current: Connecting many LED drivers to a B-curve breaker — summed inrush trips it; use C or D characteristic.
See also
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