To improve production efficiency several times the rated current of the test

Air circuit breaker (commonly known as air switch) should be extensively in industrial and mining enterprises, institutions colleges, shops and homes. Because it has good  air circuit breaker  and short circuit protection, and gradually replaced the knife switch and fuse. To  mcb circuit breaker  quality of the product, whether it is factory test or type test should be carried out time-lapse thermal tripping test. Trial is to assess the thermal effects of products, namely overload performance. In order to improve production efficiency need several times the rated current test current and multi-position to experiment, which the test bench made ​​new demands.