Change your lighting breaker to a class 2 breaker, class one's are too sensitive and the current surge of a lamp blowing takes the breaker out. The class two breakers are designed to current delay by a fraction of a second longer. Dave. such as in using circuit breakers on lighting circuits so that half the house is plunged into darkness when a bulb blows and the breaker trips! MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.