Can some explain the current fault conditions.I was explaining to a guy about inrush current on breaker being more than breaker set point for a short time period before it trips.I really don`t feel I`ve done a good job explaining it so I`m asking for some assistance.How does a breaker lets say 40 amp double pole square D home line work to protect agaist fault current.
Most convebtional CB's have a thermal component which responds, (relatively slowly) to lower level overloads in a manner which is inversely proportional (time v. current)to the overload. There is also a magnetic component, which in the event of a ground-fault or short-circuit, will respond almost instantaneously to this, normally much higher level of overcurrent.
Another term for how breakers and fuses react to overcurrent is an inverse time-current characteristic. Simply—the higher the current, the faster the device operates.
