Low-voltage circuit breakers have certain protection functions

A low-voltage circuit breaker (previously called an automatic switch) is a switching device that can not only switch on and off normal load current and overload current, but also switch on and off short-circuit current. In addition to the control function in the circuit, the low-voltage circuit breaker also has certain protection functions, such as overload, short circuit, undervoltage and leakage protection. There are many ways to classify low-voltage circuit breakers. According to their use categories, there are selective type (protection device parameters are adjustable) and non-selection type (protection device parameters are not adjustable). According to the arc extinguishing medium, there are air type and vacuum type (currently made in China). Mostly air type). Low-voltage circuit breakers have a large capacity range, the minimum is 4A, and the maximum can reach 5000A. Low-voltage circuit breakers are widely used in low-voltage power distribution systems at all levels of feeder lines, power control of various mechanical equipment, and control and protection of power terminals.

Low-voltage circuit breaker: Low-voltage circuit breaker is also called automatic air switch or automatic air circuit breaker, or circuit breaker for short. It is an electrical appliance that not only has the function of a manual switch, but also can automatically protect against loss of voltage, undervoltage, overload, and short circuit. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, etc., and automatically cut off the circuit when they experience serious overload, short circuit, and undervoltage faults. Its function is equivalent to a fuse switch and Combinations of overheating and underheating relays. Moreover, it is generally not necessary to change parts after breaking the fault current, which has been widely used.

1) Circuit breaker accessories

2) Miniature circuit breaker: Miniature circuit breaker, abbreviated as MCB, is the most widely used terminal protection appliance in building electrical terminal power distribution devices

3) Molded case circuit breaker: Molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting. Plastic case refers to the use of plastic insulators as the outer casing of the device to isolate the conductors and the grounded metal parts. Molded case circuit breakers usually contain thermal and magnetic trip units, while large models of molded case circuit breakers are equipped with solid state trip sensors.

4) Air circuit breaker

5) Intelligent universal circuit breaker