What Is a Push Button Switch: A Complete Guide

Push button switch is a very common switch in life and industry, mainly used in home appliances,  automatic equipment, apparatus and instruments. This article will Completely Guide you about the push button.

What is push button switch

Push button switch is an electrical switch that is activated by a physical movement ‘push’. It is commonly used in control circuits to start or stop processes. It is generally available in both self-locking and non-locking function modes. The push button switches have two function modes of self-locking and non-locking, highly smooth and good operating experience.

Features of Push button Switch

Simple Operation: The push button switch typically operates with a simple "press to activate" mechanism, making it easy to use in various devices and control circuits.

Momentary or Latching Actuation: Push button switches can either momentarily close the circuit when pressed (momentary) or latch into a position until pressed again (latching).

Long lifespan: Most push button switches are rated for 300,000 cycles of presses, making them ideal for repeated use in consumer electronics, machinery, and automation systems.

Low Power Consumption: Unionwell subminiature push button switches are designed to work with micro loads, and high contact reliability. Especially useful in battery-operated devices like remote controls.

Tactile Feedback: Some push button switches provide tactile feedback when pressed, which helps the user confirm that the button has been activated, especially in environments where visual confirmation isn't possible.

Two welding process: DIP and SMT,DIP is a traditional method of mounting components to a PCB, often used for through-hole components. Typically used in industrial or heavy-duty applications. SMT is a more modern used method of mounting components directly onto the surface of a PCB without needing holes. Best for consumer electronics and compact device.

Internal Structure of Push button Switch

External Part: The part of the switch that you press. It is usually made of plastic, rubber, or metal and is designed for ease of use and tactile feedback.

Spring Mechanism：Located inside the button housing, underneath the button/actuator. The spring provides the return force when you release the button, ensuring it goes back to its original position or holds it in place.

Terminals: The metal terminals inside the switch that make or break the circuit when the button is pressed. The design and placement of these contacts depend on whether the switch is a normally open (NO) or normally closed (NC) configuration.

Contact Mechanism: Located inside the switch housing, beneath the button actuator, and usually made of conductive metal, like copper or brass.

Housing: Typically made of durable plastic or metal to protect the internal components from environmental factors like dust, moisture, and physical impact.

Application

Home Appliance:In a washing machine, microwave oven or refrigerator, a circuit is usually turned on or off by pressing a switch. For example a push switch can be used in a microwave oven to open the circuit and trigger the unit to start heating when pressed.

Electronic Equipments: In electronic equipment such as televisions, computers, or sound systems, a push-button switch controls power or function selection.

Automatic Equipments: In automated equipment such as robots or automated machines, push button switches can start or stop operations, send signals to the system to change modes, or act as emergency stop buttons for conveyor systems.

How does push button switch work?

Push the button: When you apply mechanical force to the button, the internal mechanism physically moves and closes or opens an electrical contact, which in turn completes or breaks the circuit.

Electrical Contacts: Normally Open (NO) contacts are not connected when the button is not pressed. When you press the button, the contacts close, allowing current to flow. Normally Closed (NC) contacts are connected when the button is not pressed. Pressing the button causes the contacts to open, interrupting the current.

Self-Locking Push Button: Self-Locking push button also called latching push button stays in its last position until the button is pressed again. It "latches" into place when you press it.

Non-Locking Push Button: Non-Locking push button, also called momentary push button. When you press the button, it completes the circuit and turns the device on. As soon as you release the button, the circuit is broken and the device turns off. The switch only stays in the active state while you are pressing the button.

Advantages of Push button Switch

Ease of Use: Push button switches are straightforward to operate, requiring just a press to turn something on or off.

Small and Compact: They are relatively small and can be integrated into compact devices and control panels without occupying much space.

Durability: The push button switches are rated for 300,000 cycles of presses, meanwhile  waterproof, and resistant to dust and debris, which enhances their lifespan, and high stability in high-temperature environments.

Customizable: Push button switches come in various materials, and designs, which can be customized for specific needs.

Disadvantages of Push button Switch

Single Action: The basic pushbutton provides only one action and cannot be adjusted for multiple settings.

Wear and tear: Over time, the mechanical parts inside the switch, such as the spring and contacts, may wear out, especially if used very frequently.

Reduced sensitivity: After prolonged use, buttons may lose sensitivity and require more force to press.

Unsuitable for fine control: Pushbutton switches may not be able to provide fine control in applications that require more sophisticated control.

Conclusion

Push button switches are versatile, user-friendly components used in a wide range of electronic, automation and industrial applications. Their simple yet durable design, self-locking or non-locking operation, tactile feedback and long service life make them ideal for control circuits. However, there are limitations such as long-term wear and tear and single-action functions. Understanding the internal mechanics, benefits and working principles of switches helps you choose the right switch for your specific needs. Unionwell has been in the micro switch industry for 20 years and can provide you with high quality micro switches and professional service. Contact us for samples and catalogs!