OR Due to the Fault of itSelf or The Control Circuit. The Following Are the Steps and Methods to Find and Determine WHether It is a Line Fault or An Air Circuit Breake Fault.

　　After it is dermined that it is the fault of Air Circuit Breaker, Check It after Pulling Out (Drawer Type Air Circuit Breaker).

　　(1) Air Circuit Breaker Cannit Be Closed Due to the Black Out to the UnderVoltage Release

　　

　　The Fuse of Protection Circuit, SUCH As RT14, is Fused, Causing Circuit Blockage and Power Failure of Trip Coil of UnderVoltage Tripper.

　　Poor Contacts Such as Closing Butts, Relay Contorys, Auxiliary Contorys of Circuit Breaker, ETC., and Damaged Components May Lead to Circuckage and Power.

　　Broken Wires and Loose Crimping Screws in the Circuit Will Also Cause the Circuit to be blocked and the trip coil to be disconnected.

　　And burn out and lose the function of tripping coil.

　　, It Needs to be replaced.

　　(2) Failure of Mechanical System Caues Air Circuit Breaker Not to Close

　　After tripping and closing Several Times, The Operation Mechanism of Air Circuit Breaker is Severly World

　　Professional Maintenance.

　　

　　

　　Close Properly, so the elegy storage spring must be replaced.

　　Into the rotating and sliding parts when the above faults occur.

　　Structure of Air Circuit Breaker

　　The facture of the Air Circuit Breaker to Break Normally May Be Due to the Following Failures.

　　

　　To Ensure that the Air Circuit Breaker Can Be Quickly Disconnect when Circuit Needs to be disconnected.

　　

　　

　　cause the motor to overheat and burn out for a long time.

　　

　　After Each Short-Circuit CURRENT CUT-Office, The Air Circuit Breaker Shall Be Checked as Follows:

　　(1) Smoke Marks on the main and Arc contacts are wiped off with alcohol.

　　(2) If Small Metal PARTICLES FORM on the Contract Surface, They Should Be Clenet and Smoothed.

　　

　　(4) Check the control pressing spring, if it fails day to overheating, replace itacb breaker in time.

　　(5) Check WHETHER the FLEXible Connection is Broken or Not. A Few of the Broken Zones Should Be Removed. If most of the zones are braken, the flexible connection should be realed.

　　(1) Clean the Metal ParticleS and SOOT on the Wall and Grids of the Arc Extinguishing Chamber Acb Breaker. If the grids are welded or bung seriously, then should be replaced.

　　(2) If the Arc Extinguishing Chamber is damaged, it is not allowed to be used and must be replaceed.

　　(3) The Newly ExcHANGED Arc Extinguishing Chamber Should Be Dried Before Use to Ensure Good Insulation.

　　(1) Lubricating Oil Can Be Properly Filled First.