What is a electric switches or industrial switches?
The words switch are interpreted as on and off. It also refers to an electronic component that can open a circuit, interrupt current or flow it to other circuits. The most common switches are electromechanical devices operated by people, which have one or more electronic contacts. The "closed" of the contact indicates that the electronic contact is on and allows current to flow. The "open" of the switch means that the electronic contact does not conduct to form an open circuit and does not allow current to flow.
Main classification of industrial switches:
Classification by purpose: fluctuation switch, band switch, recording and playback switch, power switch, preselection switch, limit switch, control switch, transfer switch, disconnector, travel switch, wall switch, intelligent fire switch, etc.
According to the structure classification: microswitch, rocker switch, button switch, toggle switch, button switch, key switch, as well as fashionable membrane switch and point switch.
Classification according to contact type: the switch can be divided into type a contact, type B contact and type C contact according to contact type. Contact type refers to the relationship between the operating condition of "contact closing after operating (pressing) the switch" and the contact state. It is necessary to select the appropriate contact type electric switches according to the purpose.
According to the number of switches: single control switch, double control switch, multi control switch, dimming switch, speed regulating switch, splash proof box, doorbell switch, induction switch, touch switch, remote control switch, intelligent switch, card power switch and Yuba special switch.
Basic structure:
The simplest electric switches has two pieces of metal called "contacts". When the two contacts are in contact, the current forms a loop, and when the two contacts are not in contact, the current is open. When selecting contact metal, its corrosion resistance shall be considered, because most metals will form insulating oxides after oxidation, so that the contact cannot work normally. The selection of contact metal also needs to consider its conductivity, hardness, mechanical strength, cost and toxicity. Corrosion resistant metal is sometimes plated on the contact. It is generally plated on the contact surface of the contact to avoid affecting its performance due to oxides. Sometimes the contact surface will also use non-metallic conductive materials, such as conductive plastics. In addition to the contact, there will also be movable parts in the switch to make the contact conductive or non conductive. The switch can be divided into toggle switch, key switch, rocker switch, etc. according to different movable parts, and the movable parts can also be other types of mechanical connecting rods.
Selection method of switch
On the market, there are many kinds of switches and sockets, good and bad, so that consumers are at a loss when purchasing. Switches and sockets are not only a household functional product, but also the main parts for safe power consumption. Their product quality, performance and material play a crucial and decisive role in preventing fire and reducing loss.
Eye view: generally good products have flat appearance, no burr, bright color and its material adopts high-quality ABS + PC material, with good flame retardant performance and non fragile. Although the surface of some products is bright and clean, it seems to be coated with a layer of oil, but the color is pale and the texture is coarse. This kind of material has poor flame retardancy. You can ignite it with fire to try its flame retardancy. If it burns out quickly, it is good plastic, otherwise it is very poor plastic.
Hand press: a good product panel will not be removed directly by hand, but must be removed with the help of certain special tools, while ordinary non mainstream medium and low-grade products are easy to remove the lower cover by hand, resulting in indecency in homes and public places. When selecting, use the index finger and thumb to form an end point diagonally according to the face cover, press one end firmly, and press the other end hard. The product with loose and sunken face cover is of poor quality, otherwise, the quality is reliable.
Ear listening: gently press the switch function, the lighter the sound of the sliding plate, the smoother the hand feeling, and the stronger the sense of rhythm, the better the quality; On the contrary, when opening and closing, the sound is impure, dynamic and astringent, and the sound with midway intermittent state is of poor quality.
Look at the structure: there are two general switch structures:
1. Sliding plate type and swing rod type. The sound of slide switch is pure and thick, and the hand feel is elegant and comfortable; The swing bar type has a crisp sound and a slight metal impact sound. It is more stable than the traditional sliding plate type structure in eliminating arc and service life, and the technology is mature.
2. Double hole pressing plate wiring is safer than screw crimping.
Because the former increases the contact area between the conductor and electrical parts, it is resistant to oxidation and is not easy to loose, poor contact and other obstacles. When the latter screw is firm, it is easy to crush the conductor, and the contact area is small, which makes the electrical parts easy to oxidize and age, resulting in poor contact.
Material selection: pure silver switch has strong conductivity, low calorific value and high safety performance. If the contact is made of copper, the performance will be greatly reduced. The socket material adopts Tin Phosphorus raw copper sheet, which can get the best strength, toughness, elasticity and other indicators. It is dozens of times more durable than the socket with general brass as reed, and there is rarely the phenomenon of strong arc burning the socket when inserting the board. The gold-plated spring needle is extremely difficult to oxidize and has stable performance, which can ensure clear and true sound quality and fast and accurate data transmission.
Look at the sign: the rated current of the household general switch commonly used in the market is 10A, and the socket current is 10A or more,
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