Interrupting Test of Molded Case Circuit Breaker with Strong Driving Magnetic Force

강자계 구동형 460V/225A/50kA 배선용 차단기 대전력 차단성능평가

Low voltage circuit breakers which interrupt rapidly and raise the reliability of power supply are widly used in power distribution systems. In the paper, it was investigated how much Interrupting capability was improved by correcting the shape of the contact system in molded case circuit breaker(below MCCB), Prior to the interrupting testing, it was necessary for the optimum design to analyze magnetic forces on the contact system, generated by current and flux density. This paper presents both our compuational analysis and test results contact system in MCCB.