What are the main functions of circuit breakers?

1. What is a "circuit breaker"

A circuit breaker refers to a switching device that can close, carry, and break the current under normal circuit conditions, and can close, carry, and break the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The division of high and low voltage boundaries is relatively vague, and generally, those above 3kV are referred to as high-voltage electrical appliances.

2. Main functions of circuit breakers

The characteristics of circuit breakers mainly include: rated voltage Ue; Rated current In; The setting range of the tripping current for overload protection (Ir or Irth) and short-circuit protection (Im); Rated short-circuit breaking current (industrial circuit breaker Icu; household circuit breaker Icn), etc.

3. Specification and model of CHYT circuit breaker

CHYT circuit breakers are generally classified by color: white, transparent, etc.

CHYT circuit breaker is also divided into several poles, some people say several poles. 1P, 2P, 3P, 4P, etc. Divided by the number of poles: there are single pole, two pole, three pole, and four pole, etc;

4. FAQ

Q: The difference between circuit breakers and isolating switches

A: Isolation switch is a switch device mainly used for isolating power sources, switching operations, connecting and cutting off small current circuits, without arc extinguishing function. A circuit breaker refers to a switching device that can close, carry, and break the current under normal or abnormal circuit conditions.

Q: The difference between circuit breakers and air switches

A: 1. The circuit breaker is equipped with arc suppression equipment, which can trip on its own, thus breaking the current of resistance and obstacles; However, the air switch is not equipped with arc suppression equipment, so it cannot be used to disconnect resistance and obstacle currents.

2. In terms of operation, circuit breakers can be electrically controlled from a distance; And most of the air switches are manually controlled.

3. The interface insulation level of circuit breakers is relatively low, so they are usually used to handle resistance and barrier currents; And the ability to overvoltage is weak, while the insulation level of the interface of the air switch is high, usually dealing with voltage, and cannot handle resistance and obstacle currents.

4. The circuit breaker can protect the current circuit and motor, and cut off the obstacle current; Air switches are usually used for isolation purposes and operate without resistance.

A: This statement is incorrect. CHYT Electric tells you that circuit breakers are a type of electrical equipment, and their insulation level should naturally be based on their rated voltage during design, which is determined by their rated voltage. Therefore, it is incorrect to say that the insulation level of the circuit breaker is independent of the rated voltage of the circuit breaker.

Q: Does the selection of circuit breakers require the rated on/off capability of the circuit breaker

A: CHYT Electric tells you that this statement is incorrect. The breaking capacity of a circuit should be greater than or equal to the maximum fault current in the circuit.

1. First, select according to the rated voltage, and ensure that the rated voltage is consistent.

2. The rated current of the circuit breaker should be greater than or equal to the rated current of the circuit being used.

3. The rated breaking current of the circuit breaker should be greater than or equal to the short-circuit current of the circuit used.

4. Select circuit breakers that meet the requirements based on environmental conditions such as altitude, temperature, and humidity.

5. Choose high-quality and cost-effective circuit breakers based on the brand.

6. Verify the circuit breaker for special disconnection situations. However, different types of circuit breakers should be selected for different loads.