Jan 09, 2019
Molded case circuit breaker can automatically cut off the current when the current exceeds the trip setting. Plastic case refers to the use of plastic insulator as the device's shell, used to isolate between conductors and grounding metal parts. Molded case circuit breakers usually contain thermal-magnetic tripping units, while larger sizes are equipped with solid state tripping sensors. The trip unit is divided into two parts: thermal magnetic trip and electronic trip. The common rated current is as follows: 16, 25, 30, 40, 50, 60, 75, 80, 100, 125, 160, 200, 225, 250, 315, 350, 400, 500, 630A.