Momentary Push Button switch Supplier

The Button switch has the advantages of small contact resistance, precise operating force error, and diversified specifications. It is widely used in electronic equipment and white goods. Such as: audio-visual products, digital products, remote controls, communication products, household appliances, security products, toys, computer products, fitness equipment, medical equipment, banknote detectors, laser pointer buttons, etc. Because the Button switch has high environmental conditions. (Elastic force less than 2 times the pressure/environmental temperature and humidity conditions and high electrical performance), large-scale equipment and high-load buttons are replaced by conductive rubber or dome switches, such as medical equipment, TV remote controls, etc.
Regarding the pin position of the five-pin Button switch: two pins form a group, and when the pressure is applied correctly to the switch body, the four pins are turned on, and the fifth pin is used for grounding.
The Button switch is the fourth generation of switch products developed with the requirements of the development of electronic technology. The earliest size is 12mm*12mm, 8mm*8mm, and now it is 6mm*6mm. There are three types of product structures: vertical, horizontal and horizontal with ground. Now there are two types of combination (3M, 4M, SM, 6M, SM) and potentiometer Button switch combination to meet the requirements of various electronic products. There are three installation sizes: 6.5mm*4.5mm, 5.5mm*4mm and 6mm*4mm. There are 4.5mm*4.5mm small Button switches and chip Button switches abroad, and chip Button switches are suitable for surface assembly.
Now there is a fifth-generation switch—the membrane switch, which has the same function as the Button switch and is mainly used in electronic instruments and CNC machine tools, but has large resistance and poor hand feel. In order to overcome the phenomenon of poor hand feeling, there are also contact reeds installed instead of silver layer in the membrane switch.
The Button switch is divided into two categories: the Button switch that uses the metal reed as the switch contact piece, the contact resistance is small, the hand feels good, and there is a “tick” crisp sound. A switch that uses conductive rubber as a contact path is customarily called a conductive rubber switch. The switch feels good, but the contact resistance is large, generally 100-300n. The structure of the Button switch is to move down by the key, so that the contact reed or the conductive rubber block contacts the soldering piece to form a path.

Mushroom car metal push button switch

momentary circuit mini electronic-light button switch

button switch

How Button switches work
The operating force of the Button switch is related to the state of the metal reed. The starting force is proportional to the distance the metal reed is compressed. When the metal reed is compressed to 5% to 70%, the operating force suddenly decreases, accompanied by a “tick” sound. Rubber switches generally have two structures. The operating force curve varies greatly with the geometry of the rubber block.
Relative humidity: <95%
Rated voltage: 12V
Rated current: 50mA
Temperature: -25~70℃

The purpose of the Button switch
The main uses of Button switches are: color TVs, black and white TVs, audio equipment, video recorders, cameras, computers, game consoles, fax machines, walkie-talkies, batons, machine tool control devices, copying, printers, electronic instruments, meters and other household appliances .

Structural principle of push button switch
There are many types of push button switches. It can be divided into ordinary button type, mushroom head type, self-locking type, self-resetting type, rotary handle type, indicator light type, light symbol type and key type, etc. There are single button, double button, three buttons and different combinations. Generally, it adopts a water-retaining structure, which is composed of a button cap, a return spring, a static contact, a moving contact and a casing. It is usually made into a composite type, with a pair of normally closed contacts and normally open contacts. Some products can increase the number of contact pairs by connecting multiple components in series. There is also a self-holding button that automatically holds the closed position after being pressed, and can only be opened when the power is turned off.
When the button is not pressed, the moving contact is connected to the static contact above, and this pair of contacts is called a normally closed contact. At this time, the moving contact is disconnected from the static contact below. This pair of contacts is called a normally open contact: when the button is pressed, the normally closed contact opens and the normally open contact closes. Release the button to restore the original working state under the action of the return spring.

Types of Push Button Switches
(1) Protected button: a button switch with a protective shell that can prevent the internal button parts from being mechanically damaged or prevent people from touching live parts. Its code name is H.
(2) Dynamic break button: Under normal conditions, the switch contact is a push button switch that is turned on.
(3) Close button: Under normal conditions, the switch contact is a kind of button switch that is disconnected.
(4) Moving-on and moving-off buttons: Under normal conditions, the switch contacts are both on and off.
(5) Illuminated button switch: There is a signal light inside the button, which is not only used to issue operation commands + but also serves as a signal indicator, and its code is D.
(6) Action click button: that is, click the button switch with the mouse.
(7) Explosion-proof button: a button switch that can be used in places containing explosive gas and dust without causing explosion, and its code is B.
(8) Anti-corrosion push button switch: It can prevent the intrusion of chemical corrosive gases, and its code is F.
(9) Waterproof push button switch: with a sealed shell to prevent the intrusion of rainwater, its code is S.
(10) Emergency button: There is a big red mushroom button protruding outside, which can be used as a button switch for cutting off the power in an emergency, and its code is J or M.
(11) Open button: a button switch that can be used to be embedded and fixed on the panel of the switch board, control cabinet or console, and its code is K.
(12) Interlocking button: a button switch with multiple contacts interlocking, its code is C.
(13) Knob button: Rotate the handle to operate the contact. There are two positions of on and off, generally a button switch of the panel mounting type, and its code name is X.
(14) Key-type button: a button switch that is operated by inserting and rotating a key, which can prevent misoperation or be operated by a special person, and its code is Y.
(15) Self-holding button: a button with a self-holding electromagnetic mechanism inside the button switch, its code name is z.
(16) Combined button: A button switch with a combination of multiple buttons. Its code name is E.

2 pin-4 pin red power button switch wiring diagram

electrical-led arduino button switch diagram

Emergency stop switch E-stop with LED light 12V 24V 220V

RATING : 3A 125VAC/1.5A 250VAC~T85
CONTACT RESISTANCE: 30mΩMAX.
INSULATION RESISTANCE: 100MΩMIN.
DIELECTRIC STRENGTH: AC 500V rms (50-60Hz) FOR 1 MIN TRIP CURR ENT: 0.5mA.
OPERATING FORCE: 300gf-700gf.
LIFE TEST : TO 10,000, CYCLES AT A SPEED OF 15 TO 18 CYCLES, FOR 1 MIN.
PRACTICAL TEMPERATURE RANCE : – 25℃～+85℃.

CONTACT RATING: Dependent upon contact material see page 108.
MECHANICAL LIFE: 50,000 make-and-break cycles.
CONTACT RESISTANCE: 20m max. initial @ 2-4VDC 100mA for both silver and gold plated contacts.
INSULATION RESISTANCE: 1,000M min.
DIELECTRIC STRENGTH: 1,000 Vrms min.@sea level.
OPERATING TEMPERATURE: -30°C to 85°C.
MATERIALS
CASE: Diallyl phthalate (DAP) (UL94V-0).
PLUNGER: Glass filled Nylon or Glass filled polyester.
BUSHING: Brass, nickel plated.
HOUSING: Stainless Steel.
CONTACT: Copper alloy, silver or gold plated.

Selection of button switches

(1) According to different use occasions and specific purposes: select the type of button according to the use occasion, such as open type, protective type, waterproof type, anti-corrosion type, etc. Choose the appropriate form according to the purpose, such as the handle rotation type, key type, emergency type, lighted type, etc. For example, the general buttons on the panel of the console cabinet can be opened first;
If you need to display the working status, use the indicator light type;
In very important places, in order to prevent misoperation by unrelated personnel, it is advisable to choose the type with a key;
Anti-corrosion type should be used where there is corrosive gas.
(2) Select the color of the buttons and indicator lights according to the requirements of the working status, instructions and working conditions: green is used to indicate “start” or “power on”, and red is used to indicate “stop”. In addition, the voltage (bulb) of the indicator light is divided into 6.3V, 12V, 24V and so on.
(3) Determine the number of different buttons according to the needs of the control loop: such as single button, double button, triple button, multi-button, etc. For example, when three controls of “forward”, “reverse” and “stop” are required, three buttons can be used and installed in the same button box;
When it only needs to be used for “start” and “stop” control, two buttons are assembled in the same button box.
Maintenance of button switches
(1) The button should be checked frequently to remove the dirt on it. Due to the small distance between the contacts of the button, after many years of use or when the seal is not good, dust or various stages of oil emulsion will flow in, which will cause insulation reduction or even a short circuit accident. In this case, insulation and cleaning must be carried out, and corresponding sealing measures must be taken.
(2) When the button is used in a high-temperature environment, it is easy to deform and age the plastic, causing the button to loosen and causing a short circuit between the wiring screws. According to the situation, a fastening ring can be added to tighten it during installation, and an insulating plastic tube can also be added to the wiring screw to prevent loosening.
(3) The button with indicator light will heat up the bulb, which will easily deform the plastic lampshade after a long time, making it difficult to replace the bulb. Therefore, it is not suitable to be used in places where the power-on time is long; if you want to use it, you can properly reduce the voltage of the bulb to prolong its service life.
(4) If poor contact is found, the cause should be found out: if the contact surface is damaged, it can be repaired with a fine file;
If there is dirt or soot on the contact surface, it should be wiped clean with a clean cotton cloth dipped in solvent;
If the contact spring fails, it should be replaced;
If the contacts are severely burned, the product should be replaced.