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-   -   Short time breaking capacity of a CIRCUIT BREAKER? (https://www.askmehelpdesk.com/showthread.php?t=330681)

  • Mar 17, 2009, 11:20 PM
    swa
    Short time breaking capacity of a CIRCUIT BREAKER?
    When we define ratings of a CB SHORT TIME CURRENT RATING & SHORT TIME BREAKING CAPACITIES to be mentioned .So what o we mean by them??
  • Mar 21, 2009, 06:23 AM
    Perito

    Circuit breakers are rated for current and current at time. In order to avoid trips for transient events, the circuit breaker might be rated to break at Current A for 1 Sec, but at a higher current, current B, it might break at 100 mSec.
  • Mar 23, 2009, 07:46 AM
    sarnian
    Hello swa

    Perito's answer is correct. The higher the voltage or the current, the faster the switching has to go, to shorten arcing and resulting damage.
  • Apr 18, 2009, 09:30 AM
    sathe1963
    By means of short time current rating of acb, we understand that the circuit breaker will withstand up to that peak current for specified / designed time duration say 1 second or 3 seconds without any damages caused to the cb.

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