• What is the Curve on a CE (European) Sensor Module Breaker? 

    • Prior to 1998 all breakers were D curve.
    • Since 1998 all single pole breakers have been changed to C curve.
    • All double pole breakers are still D curve.
    • C & D Curves are defined by a European Standard. A is the fastest curve, D is the slowest.


    The curve letter describes the trip time/current for overcurrent tripping.  It is an important parameter for installers.