Low Voltage Circuit Breaker and Contactor Industry Background and Pain Points

A circuit breaker is a switching device that can close, carry, and break normal or abnormal currents. It is an important electrical device for protection and operation in the power system, which can be used for distribution, infrequent starting, and protection of power lines and motors, etc.

Circuit breakers are divided into high - voltage circuit breakers and low - voltage circuit breakers according to their application range

Basically, a circuit breaker consists of a conductive main circuit, an insulating support, and an operating mechanism, although it has many different structures and types.

Firstly, the rated voltage of the circuit breaker should be equal to or greater than the line rated voltage.
Secondly, the rated current of the circuit breaker should be greater than or equal to the rated current of the circuit used.
For the selection of distribution - type circuit breakers, motor - protection - type circuit breakers, household - protection - type circuit breakers, and leakage circuit breakers, there are also more specific selection methods. For example, for distribution - type circuit breakers, the allowable current - carrying capacity of the line should not be less than the long - delay action current setting value of the circuit breaker; for motor - protection - type circuit breakers, when choosing, it is necessary to consider the characteristics of the motor's starting current and overload capacity; for household - protection - type circuit breakers, the rated capacity current size is very important, and it should be selected appropriately according to the actual situation to avoid frequent tripping or failure to trip when a fault occurs; for leakage circuit breakers, it is necessary to pay attention to factors such as the rated current of the overload release, the ultimate breaking capacity, the leakage current to be protected, and the normal working voltage and current of the line equipment.

An air switch is a type of low - voltage circuit breaker. However, compared with other circuit breakers, there are differences in voltage levels, short - circuit current - breaking capabilities, etc.

When installing a circuit breaker, it is necessary to ensure that the installation method is correct, the model and load size are suitable, and the configuration scheme is scientific and feasible. At the same time, for different types of circuit breakers (such as MCCB and MCB), their application scenarios should also be considered.