The household air switch is selected according to the purpose of the line.

Air switch, (circuit breaker), full name automatic air circuit breaker, also known as air switch, is a commonly used low-voltage protection electrical appliance that can realize short circuit, overload and other functions. Circuit breakers are used as main power protection switches or branch line protection switches in household power supply. When a short circuit or overload occurs in residential circuits or household appliances, it can automatically trip and cut off the power supply, thereby effectively protecting these equipment from damage or preventing the expansion of accidents; households generally use two-pole (ie 2P) circuit breakers for main power protection, Use single pole (1P) for branch protection; if the rated current of the circuit breaker is selected too small, the circuit breaker will easily trip frequently and cause unnecessary power outages. If the selection is too large, the expected protection effect will not be achieved, so home improvement For circuit breakers, it is very important to correctly select the rated capacity current. The general miniature circuit breaker specifications are mainly divided into 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, etc. by rated current.

For example, a 10A air switch is normally used for the lighting circuit, a 16A air switch is used for the outlet circuit, 20A or 25A for water heaters and air conditioners, and 63A for the main switch.

The air switch is used as a main power protection switch or branch line protection switch in the household power supply. When a short circuit or overload occurs in residential wiring or household appliances, it can automatically trip and cut off the power supply, thereby effectively protecting these equipment from damage or preventing accidents from expanding.

Households generally use two-pole (ie 2P) circuit breakers for main power protection and single-pole (1P) for branch protection. If the rated current of the circuit breaker is selected too small, the circuit breaker is likely to trip frequently and cause unnecessary power outages. If the selection is too large, the expected protection effect will not be achieved. Therefore, the correct selection of the rated capacity current of the home improvement circuit breaker is very important. important. The general miniature circuit breaker specifications are mainly divided into 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, etc. by rated current.

Household air switch specifications

At present, DZ series air switches are used in families, and the following air switch specifications are common:

NDB1-63, NDB1-125, NDB2-63, NDB2Z-63, NDB1L-32 and other specifications, where C represents the trip current, that is, the trip current. For example, NDB1-63 indicates the trip current is 1A~63A.

The wrong installation of the air switch or the wrong wiring problem may cause a short circuit of the circuit and cause a safety accident such as fire. It can be seen that understanding the installation of the air switch, the wiring method of the air switch, and the selection of the air switch model are very important for the safety of the family.

The air switch is used as a main power protection switch or branch line protection switch in the household power supply. When a short circuit or overload occurs in residential wiring or household appliances, it can automatically trip and cut off the power supply, thereby effectively protecting these equipment from damage or preventing accidents from expanding; households generally use two-pole (ie 2P) air switches for main power protection. Use single pole (1P) for branch protection; if the rated current of the air switch is selected to be too small, the air switch is likely to trip frequently and cause unnecessary power outages. If the selection is too large, the expected protection effect will not be achieved, so home improvement For air switches, it is important to correctly choose the rated capacity and current. General small air switch specifications are mainly based on the rated current area of ​​6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, etc.; then, how does the average family choose or check the total value of the total load current?

1. First calculate the value of each branch current

• Pure resistive loads, such as light bulbs, electric heaters, etc., can be obtained by directly dividing the indicated power by the voltage, the formula I=power/220v; for example, for a 20w bulb, the branch current I=20W/220=0.09A. Electric fans, electric irons, electric blankets, electric water heaters, electric heaters, rice cookers, electric frying pans, vacuum cleaners, air conditioners, etc. are resistive loads.
• Inductive loads, such as fluorescent lights, televisions, washing machines, etc. The calculation is slightly complicated, and the power consumption should be considered, and the specific calculation should also consider the power factor. To facilitate the estimation, the author gives a simple calculation method, that is, the general inductive load. It is sufficient to indicate that the calculated power of the load is doubled. For example, indicate that the branch current of a 20W fluorescent lamp is I=20W/220v=0.09A, which is doubled to 0.09A*2=0.18A (than the exact calculated value of 0.15A , 0.03A more)

2. The total load current is the sum of the branch currents; if you know the branch current and the total current, you can select the branch air switch and the main switch air switch, the main fuse, the main electric meter and the specifications of each branch wire, or the check calculation has been designed Whether the specifications of these electrical components meet the safety requirements;

3. In order to ensure safety and reliability, the rated working current of electrical components should generally be greater than 2 times the required maximum load current; in addition, when designing and selecting electrical components, the possibility of future increase in electrical load should also be taken into account. Need to leave a margin;