Technical Appraisal Method of Circuit Breaker Material Evidence in Fire

Abstract Circuit breaker is an important electrical control on and off in the line, which refers to switch device that can close, load break current under normal loop conditions, abnormal conditions specified time. breakers are divided into high voltage circuit low according their range of use. Low common molded case breakers. Play a protective role safety lines appliances. When fire occurs, action plays vital occurrence development fire. Therefore, material evidence investigation cause fire, it will play irreplaceable cause. In particular, plastic most commonly used type life. The extracted from scene, appearance characteristics or internal structure characteristics, identify its working state period time before after judge relationship between physical