Common faults and mechanical failures of electrical circuits are described as follows. 1, 2 electrically common failure, mechanical failure of one common) actuator rod fall off. 2) closing the core jam. 3) After opening the circuit breaker mechanism not revert to the pre-engagement position. 4) trip trip mechanism. 5) closing the solenoid operating voltage is too high Xinjiang breaker failed to hook the hook. 6) did not return opening link. 7) organization stuck a pin connecting portion of the shaft off, so that organizations empty fit. 8) sometimes several times in a row to make switching action breaker closing, then the Department of auxiliary switch normally closed contacts to open prematurely. Within ZN28A-12 series indoor high voltage vacuum circuit breaker (within ZN28-12 integrated indoor high voltage vacuum circuit breaker) is a three-phase AC 50Hz Xi'an breaker, rated voltage of 12kV indoor high voltage switchgear circuit breakers, mainly used for fixed switch devices, or replace the old switch devices less oil circuit breakers, also mounted on the protection and control elements withdrawable switchgear, and applies to places frequent operation. Products meet GB1984 "AC high voltage circuit breakers", JB3855 "AC high voltage vacuum circuit breaker within 3.6-40.5kV households" standards and DL / T403 "within 12-40.5kV indoor high voltage vacuum circuit breaker ordering technology" requirement. Henan Shangluo breaker breaker _ _ Huayi electricity provided by Xian Huayi power plant. Xian Huayi power plant (www.xahy.com) strong, credible, in Xi'an high-voltage circuit breakers and other industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Huayi power and you hand into the brilliant, for a better future!