Intelligent Universal Circuit Breaker, also known as frame circuit breaker, or air circuit breaker (ACB), is a mechanical switch that can make, carry and break current under normal circuit conditions, and can also make, carry, and break current under specified abnormal circuit conditions. electrical appliances. Universal circuit breakers are used to distribute electric energy and protect lines and power equipment from overload, undervoltage, short circuit, etc. Such circuit breakers generally have a steel frame in which all components are mounted. It has a large capacity, can be equipped with multi-function release units and more auxiliary contacts, and has high segmentation capacity and thermal stability, so it is often used in places requiring high breaking capacity and selective protection.