The pushbutton switch is the simplest component in an electrical appliance, but controls the lifeblood of the circuit, hence the name "master switch". It is a low-voltage appliance that can be reset manually and automatically. The pushbutton is usually used in circuits to issue start or stop commands to control the switching on and off of electrical coils, such as electromagnetic starters, contactors and relays, i.e. to switch on or off small current circuits within a short period of time. They are generally used in control circuits with AC and DC voltages of up to 440 V and currents of less than 5 A. They are generally not directly manipulated in the main circuit, but can also be used in interconnected circuits.

It is also important for purchasers to have a comprehensive understanding of the types and functions of pushbutton switches, and to be aware of new switches and trends in the industry. In the following sections we will give you a detailed overview of the classification of conventional pushbutton switch tubes, metal pushbutton switches and the new metal doorbell pushbutton switches.

Classification of conventional pushbutton switches

I. Classification according to the use and the structure of the contacts

1. Normally closed button 2. Normally open button 3. Composite button

II. Classification according to operation and protection mode

Depending on the mode of operation and the applicable scenario, the button categories can also be:

1.Waterproof: with sealed housing. Protects against ingress of water.

2.Corrosion-proof: protected against the intrusion of corrosive chemical gases.

3.Explosion-proof: can be used in places containing explosive gases and dust without causing an explosion, e.g. in coal mines.

4. Knob type: the contact can be operated by turning the handle. There are two positions of on and off, generally for panel mounting type.

5. Key type: Use the key to insert the rotation for operation. It can prevent misoperation or for dedicated operation.

6. Open type: suitable for inlay fixing on the switchboard, control cabinet or console panel.

7. Protection type: with protective enclosure to prevent mechanical damage to the internal push-button parts or human contact with live parts.

8. Emergency type: with a large red mushroom head protruding from the outside, used to cut off power in case of emergency.

9. Self-sustaining button: The button is equipped with a self-sustaining electromagnetic mechanism and is mainly used in power plants, substations or test equipment, where the operator interchanges signals and issues instructions for board operation.

10. Button with light: the button is equipped with a signal light, in addition to the release of operating instructions, but also for signal instructions, mostly used in control cabinets, control panels.

11. Combination type: Combination of multiple buttons.

12. Interlocking type: multiple contacts interlocked.

In practice, in order to prevent misuse, the buttons are usually marked or coloured in different ways to prevent misuse, with colours such as red, yellow, blue, white, black and green. Generally red means "stop" or "dangerous" operation; green means "start" or "on". ". The emergency stop button must be a red mushroom-headed button. The pushbutton must have a metal protective stopper which is higher than the button cap to prevent accidental touching of the button. The button plate and button box on which the button is mounted must be of metal and connected to the machine's main earth bus.

Metal pushbutton switches

Pushbutton switches are also classified by material, such as metal and plastic. Metal switches are shown below.

Metal pushbutton switches are more durable than plastic ones. HomeBest switches are designed with artisanal craftsmanship, utilising high precision CNC machine tool cutting technology to make the metal housing a one-piece unit with high structural strength. It’s drop and impact resistant, and more environmentally friendly. The metal pushbutton switch has a built-in waterproof seal and is IP66 rated. Moreover, the metal material combined with silver alloy contacts is more resistant to voltage and current and more conductive. The button housing is made of nickel-plated brass and stainless steel for corrosion and rust resistance.

New metal doorbell pushbutton switches

The metal doorbell pushbutton switch is a newer style and is more popular in areas such as Saudi Arabia and the UAE. The new doorbell pushbutton switch is made from 304 stainless steel, which is robust and wear resistant. And it features a brushed metal finish, making the product more aesthetically pleasing. The switch is also designed with screw holes, fixed with screws, stable and firm without shaking, easy to disassemble and install. There are three main button diameters, 16/19/22mm, which are in line with the aperture of the panel. You can also choose whether to have a light or not and the colour of the light. The diagram below shows the effect of the button with light.

We believe that through the above introduction, you have a more comprehensive understanding of the types of pushbutton switches and metal pushbutton switches, and choose the one you need. If you have any questions, please feel free to contact us or visit our website: www.hbsocket.com