CJ Electric Company provides customers around the world with complete solutions, a full range of products and components, and attentive service under its four major globally-recognised brands in five markets: Energy & Infrastructure, Industrial, Buildings & Residential, Data Centres and Networks. These leading global brands include - MLG, Seraphim Power, TE Appliances and Qisheng Switchgear - as well as strong localised brands and recognition in their respective fields.

Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use, high-voltage and low-voltage boundary demarcation is relatively fuzzy, generally will be more than 3kV is called high-voltage appliances. Low-voltage circuit breaker, also known as automatic switch, commonly known as "air switch" also refers to low-voltage circuit breakers, it is a kind of both manual switching, but also automatically for the loss of voltage, undervoltage, overload, and short-circuit protection of electrical appliances. It can be used to distribute power, infrequent start asynchronous motors, power lines and motors and other protection, when they occur serious overload or short circuit and undervoltage faults can automatically cut off the circuit, its function is equivalent to the combination of fuse-type switches and over-under thermal relays. Its function is equivalent to the combination of fuse-type switch and over/under thermal relay, etc. Moreover, it does not need to change the parts after breaking the fault current, so it has been widely used.

Low-voltage circuit breaker, also known as automatic air switch, can be used to connect and break the load circuit, can also be used to control infrequent starting motor. Its function is equivalent to the sum of some or all of the functions of the electrical appliances such as gate switch, overcurrent relay, loss of voltage relay, thermal relay and earth leakage protector, etc. It is an important protection electrical appliance in the low-voltage power distribution network.

Low-voltage circuit breaker has many protection functions (overload, short-circuit, under-voltage protection, etc. ), adjustable action value, high breaking capacity, convenient operation, safety and other advantages, so it is widely used at present. Structure and working principle of low-voltage circuit breaker consists of operating mechanism, contact, protection device (various disconnectors), arc extinguishing system.