Surge protector question...

Discussion in 'General Electronics Chat' started by mbohuntr, Aug 5, 2012.

  1. mbohuntr

    Thread Starter Active Member

    Apr 6, 2009
    413
    32
    I was following the thread on surge protection, and looked up a leviton model since I was considering putting one in. If the protection is parallelled in on the load side of the 20 amp breaker as in the instructions ,
    http://www.smarthome.com/manuals/4860.pdf

    would't the breaker trip instantly still exposing the rest of the circuits to high transients?
    We regularly test industrial breakers for both time over current, and instantaneous current. The latter being electronic trip. Are residential breakers both, or time over current only?
     
  2. westom

    Member

    Nov 25, 2009
    52
    5
    Breaker trips in milliseconds or seconds. Surges are microseconds events. Maybe 300 consecutive surges would pass through a breaker before it even thought about tripping.

    Those same microsecond numbers also say why the connection to earth must be so short, no sharp wire bends, etc. Microseconds is why wire impedance (not resistance) is a dominant parameter.
     
    Last edited: Aug 6, 2012
    mbohuntr likes this.
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