Almost every breaker manufactured now is SWD rated (15 & 20A SINGLE pole.. Even the tandem breakers made by Cutler and Sq-D are SWD rated... The only breaker I found without a SWD rating on it is the narrow (1/2") Federal Pioneer style. Their regular (1") version ARE rated SWD..
I agree that using a contactor and a switch is the ultimate way to go, but I think one of the reasons they used the breakers as switches was it was simpler and cheaper to eliminate extra swiches, contactors and the like, and for some applications, it was the ideal method of lighting control.
A.D
