First, what is the home air switch?
Compared with the traditional power switch, the home air switch is a controller with a low voltage distribution network and an electric drive system. The use of the control and protection functions during the use process is more prominent. In the absence of complete contact and breaking of the circuit, the same For the passage of electrical equipment or load protection. In addition, it is also appropriate to use a ground start motor. Home air switch working principle: When the working current exceeds the rated current, short circuit, loss of pressure, etc., automatically cut off the circuit.
Home air switch is also divided into several P, some people say that a few poles.
From 1P to 4P (1P thickness is 18MM, 2P is 36MM...), 1P is 1 line in and out, 2P is 2 lines in and out, and so on. Home generally use 1P or 2P, 1P and 2P difference is that 1P can only disconnect a FireWire, 2P is able to disconnect the FireWire and the zero line is also 1P+N, so the relative point of 2P is better. If you load the device rated voltage is 220V, you can use 1P or 2P home air switch, if it is 380V, you need 3P or 4P, and you do not need zero for the load device, you can only choose 3P, such as the motor , Fans, pumps, etc. only use 3P home air switch; if 380V water heater, water heater and the like equipment, you need 4P, but also with home air switch leakage protection function, which is to prevent leakage accidents, protect the human body Safety is a must to use.
Second, what are the home air switch models?
At present, the home uses DZ series of household air switches (miniature circuit breakers with leakage protection), common are the following models / specifications: C16, C25, C32, C40, C60, C80, C100, C120 and other specifications, where C represents the trip Current, that is, take-off current, for example, C32 means that the starting current is 32 A. Generally, 6500W water heater should use C32, and 7500W and 8500W water heater should use C40 air-opening.
The common models in industry are: DW and DZ types for power circuits: 20, 32, 50, 63, 80, 100, 125, 160, 250, 400, 600, 800, 1000 ... (unit A).
Example: DZ10-100/330 Ie=60A
Description: DZ - "Automatic" anti-Pinyin, 10-- design number, 100 - is its shell level, 3- - indicates the pole number that is three-phase, 3-- tripping form (0-- no off Retainer, 1--thermal release type, 2--electromagnetic release type, 3--plex type, 0--with or without auxiliary contact (0-- no auxiliary contact, 2-- auxiliary contact Head), Ie = 60A - over-current regulation rated current.
Key points: 1. The rated voltage of the household air switch is equal to or greater than the rated voltage of the line; 2. The rated current of the household air switch and the current rating of the overcurrent release are greater than or equal to the calculated load current of the line.
Third, the choice of home air switch
The air switch is used as the main power protection switch or branch line protection switch in home power supply. When a residential line or household appliance is short-circuited or overloaded, it can automatically trip, cut off the power supply, thereby effectively protecting these devices from damage or preventing the accident from expanding; the home generally uses a 2-pole (2P) air switch for total power protection, Use unipolar (1P) as branch protection; if the rated current of the air switch is too small, the air switch will frequently trip, causing unnecessary power failure. If the selection is too large, the expected protection effect will not be achieved. Air switch, it is very important to choose the rated capacity current correctly. General small air switch specifications mainly in the rated current area 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, etc.; then the average family how to select or check the total value of the total load current?
1. First calculate the value of each branch current
1 purely resistive load, such as light bulbs, electric heaters, etc. with the stated power divided by the voltage directly, that formula I = power / 220v; for example, 20w bulb, branch current I = 20W/220 = 0.09A. Fans, electric irons, electric blankets, electric water heaters, heaters, rice cookers, electric fryers, vacuum cleaners, and air conditioners are all resistive loads.
2 Inductive loads, such as fluorescent lamps, televisions, washing machines, etc., are slightly more complicated to calculate, and power consumption must be taken into consideration. The power factor must be considered for specific calculations. For ease of estimation, the author gives a simple calculation method that is general inductive load. It indicates that the power calculated by the load can be doubled. For example, the branch current of the 20W fluorescent lamp is I=20W/220v=0.09A, and the doubled value is 0.09A*2=0.18A (more than the 0.15A calculated value.) , more than 0.03A)
2. Select the appropriate switch based on the current
The total load current is the sum of the branch currents; the branch current and the total current are known, and the branch air switch and the main air switch, the total fuse, the total meter and the specifications of the branch wires can be selected, or the check has been designed. The specifications of electrical components meet the safety requirements;
3. Must consider the power load
In order to ensure safety and reliability, the rated working current of electrical components should generally be greater than 2 times the maximum load current; In addition, when designing and selecting electrical components, it is also necessary to take into account the possibility of future increase in electrical load, and to maintain for future needs. There is a margin; the following table shows the calculation load of several common homes and the rated current of the main switch:
Editor's summary: The above is the home air switch how to choose, home air switch selection methods related to the introduction, hoping to help meet the needs of friends! For more information, please continue to follow our website. Follow-up will present more exciting content!
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