What is the use value of low voltage circuit breakers?

There are many classification methods for low voltage circuit breakers. Depending on the type of use, there is a selective type (protective device parameters are adjustable) and a non-selective type (protective device parameters are not adjustable). Depending on the arc extinguishing medium, there are air type and vacuum type.

• What is the use value of low voltage circuit breakers?

• What parameters should be considered when selecting a low voltage circuit breaker?

• What is a low voltage circuit breaker?

What is the use value of low voltage circuit breakers?

low voltage circuit breakers are electrical devices used for switching, controlling or protecting circuits with AC voltage of 1200 V and DC voltage of 1500 V. low voltage circuit breakers are an important part of the electrical industry and basic accessories in the machinery industry. In the power distribution system, low voltage switchgear mainly consists of various low voltage circuit breaker components. The functions and performances of low voltage circuit breakers play a crucial role. More than 80% of the electrical energy generated by power generation plants is distributed and used via low voltage circuit breakers. For each additional 10,000-kW power generation system, approximately 20,000 pieces of different low voltage circuit breakers are required to adjust them. Industrial automation systems also require various control panels, consoles, controllers and other products consisting of low voltage circuit breakers.

What parameters should be considered when selecting a low voltage circuit breaker?

1) Type:

The type of circuit breaker includes the number of phases, the number of poles, the rated frequency, the arc extinguishing medium, the closing method and the shutdown method.

2) Rated power of the main circuit:

Main circuit ratings are:

rated operating voltage; rated current; rated short-term switching capacity; Design short-term current resistance.

The rated current of the universal circuit breaker is also divided into the rated current of the main circuit and the rated current of the frame plane.

3) Work system assessed:

The rated load system of low voltage circuit breakers can be divided into two types: 8-hour system and long-term system.

4) Subcircuit parameters:

The auxiliary circuit parameters of low voltage circuit breakers are mainly the characteristic parameters of auxiliary contacts. Universal circuit breakers usually have 3 pair closers and 3 pair openers for signal devices and control circuits; Compact circuit breakers usually have no auxiliary contacts.

What is a low voltage circuit breaker?

low voltage circuit breakers are also called automatic air switches or automatic air circuit breakers or short circuit breakers. It is an electrical device that has both manual switching functions and automatic power failure, undervoltage, overload and short circuit protection. It can be used to distribute electrical energy, rarely start asynchronous motors, protect power supply lines and motors, etc. Its function corresponds to a fuse switch and overheating relay and other combinations. In addition, it is generally not necessary to replace parts after the residual current is interrupted, and it is widely used.

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