why after i add circuit breaker to my model in simulink, results at scopes became interruptable after circuit breaker opens?

my model in simulink run correctly(simply consist of electrical source connected to induction motor) but after i add circuit breaker initially closed to my model, i notice that results at scope be correct when circuit breaker be close and be interrupt with a very hiagh value with strait vertical line exactlt after the time of opening circuit breaker(transition time). my model in discrete mode and i tried to change a lot of parameters such as solver type and parameters of circuit breaker but i get the same result , have i add a special block or what should i do? thanks for all