fuse。

KM- ac contactor.

KA- intermediate relay.

Ki- Overcurrent (Undercurrent) Relay.

KT- thermal relay.

Push button switch.

SQ- travel switch.

Electricity (electricity and equipment) refers to the production, transmission, distribution and use of electric energy, electrical equipment manufacturing and other disciplines or engineering fields. It is a science to create, maintain and improve confined space and environment by means of electric energy, electrical equipment and electrical technology, covering the conversion, utilization and research of electric energy, including basic theory, applied technology, facilities and equipment, etc.

Electrical Engineering (EE) is one of the core disciplines in the field of modern science and technology, and it is also an indispensable key discipline in today's high-tech field. It is the great progress of electronic technology that promotes the arrival of the information age based on computer network and will change the way of human life and work. The development prospect of electrical engineering also has great potential, which makes the employment rate of students always high.