... serial number….-Easy operate, automatically complete the test of single-closing, single-opening by pressing the button of test, also displaying ... -Six CB O/C state can be carried out: single open, single close, O-θ-CO, O-θ-CO-t-CO,CO-t ... form, bouncing amplitude, bounce ,over-travel,-Be able to test circuit breaker mechanical characteristics such as asynchronism, opening & closing speed, opening & ...