Circuit breakers inside the electrical ready board box

The circuit breakers inside the electrical ready board box are an important component of the distribution system, playing a critical role in protecting circuits, electrical appliances, and personal safety. The following is a detailed analysis of the circuit breaker inside the electrical ready board box:

1、 Basic functions of circuit breakers

Circuit breakers, also known as air switches or air circuit breakers, mainly have the following functions:

Overload protection: When the current in the circuit exceeds the rated current of the equipment, the circuit breaker will automatically cut off the power supply to prevent equipment from overheating and damage or causing a fire.

Short circuit protection: In the event of a short circuit in the circuit, the circuit breaker can quickly cut off the power supply, preventing the short circuit current from causing damage to the circuit and equipment.

Undervoltage protection (some models have it): Some circuit breakers can also monitor the grid voltage and automatically cut off the power supply when the voltage is too low to protect electrical equipment from damage.

2、 Types of Circuit Breakers

In the electrical ready board box, common types of circuit breakers include ordinary circuit breakers and residual current circuit breakers (leakage protection):

Ordinary circuit breaker: mainly used for overload protection and short circuit protection, commonly used in main switches and lighting circuits. They do not have leakage protection function, but their price is relatively cheap.

Leakage circuit breaker: In addition to the functions of a regular circuit breaker, it can also achieve leakage protection. When there is a leakage in a circuit or electrical appliance, a residual current circuit breaker can quickly cut off the power supply, avoiding electric shock accidents. There is usually a test button on the residual current circuit breaker to check if it is working properly.

3、 Number of poles of circuit breaker

The common pole numbers for household circuit breakers are 1P, 1P+N, and 2P:

1P circuit breaker: can only control the on/off of one live wire, does not provide protection for the neutral wire. It occupies a small circuit width, is inexpensive, and is commonly used in lighting circuits.

1P+N circuit breaker: can simultaneously control the on/off of neutral and live wires, but only provides protection for live wires. In some cases, the neutral wire will always be in a conductive state.

2P circuit breaker: It can simultaneously control the on/off of neutral and live wires, and provide protection for both. It has the best protection effect, but it is more expensive and occupies more circuits.

4、 Principles for selecting circuit breakers

When selecting circuit breakers for electrical ready board boxes, the following factors should be considered:

Circuit requirements: Select the appropriate number and type of circuit breakers based on the number of circuits in the electrical ready board box.

Load characteristics: Select the appropriate rated current and trip type of circuit breaker based on the current size and nature of the load.

Safety requirements: For circuits that require leakage protection (such as socket circuits), leakage circuit breakers should be selected.

Economy and reliability: Considering the economy and reliability of circuit breakers while ensuring safety, choose products with high cost-effectiveness.

In summary, the circuit breakers inside the electrical ready board box are important protective devices in the distribution system. They ensure the safe operation of circuits and electrical appliances by implementing functions such as overload protection, short circuit protection, and leakage protection. When selecting a circuit breaker, comprehensive consideration should be given to factors such as circuit requirements, load characteristics, safety requirements, and economy.