Romac, Inc.

Industrial Circuit Breakers

A circuit breaker is either integrally designed or programmed to trip or open automatically at designated points on an inverse time-current curve. The higher the overload, the sooner the breaker will open. A breaker may allow 125% of rated current to flow for five or more minutes, whereas a breaker exposed to 600% or more (fault condition) of rated current should trip instantly. In addition to basic short circuit and overload protection, most 600V class breakers of the last several generations allow someone to customize the curve on which the breaker trips.