Quick-make, quick-break switch mechanism combined with inverse time element tripping operation and trip-free handle design. type CH circuit breakers trip to the off position, eliminating nuisance callbacks. the CHF family also includes a trip flag to differentiate between a trip and the breaker being turned off the thermal magnetic trip curve avoids nuisance tripping on mild overloads while reacting almost instantaneously to severe short circuit conditions. multi-pole breakers have internal common trip connection to operate all poles simultaneously. handles are marked with ON-OFF indication and ampere rating of the breaker.