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1241.8559 Pushbutton Switches: Application field and Working Principle

Pushbutton switches are electrical components which are used to control the flow of electricity in circuits. They are typically used to start or stop a process, or to select between multiple options. Pushbutton switches can be found in a wide variety of applications, such as appliance control, lighting control, industrial automation and robotics. As a rule-of-thumb, pushbutton switches are generally used for applications where a single momentary contact is needed.

Applications Fields

Pushbutton switches are used in a variety of applications. Common applications include:

• Lighting Control: Pushbutton switches can be used to control lighting in areas such as hallways, stairwells, and bathrooms. They can also be used to control outdoor lighting.
• Appliance Control: Pushbutton switches can be used to control a variety of appliances, such as fans, pumps, and heaters. They can also be used to control security systems, sprinkler systems, and garage door openers.
• Industrial Automation: Pushbutton switches are used to control common industrial processes, such as sorting, inspecting, packing, and assembling.
• Robotics: Pushbutton switches can be used to control robotic equipment, such as arms, grippers, and conveyor belts.

Working Principle

Pushbutton switches typically consist of a stationary contact, a movable contact, a spring, and a button. When the button is pressed, it pushes the movable contact towards the stationary contact, completing the circuit. When the button is released, the spring pushes the movable contact away from the stationary contact, breaking the circuit.

Pushbutton switches come in a variety of form factors and configurations. Momentary pushbutton switches are usually single pole, single throw (SPST) switches. These switches are normally open, meaning that the circuit is opened when the button is released. Alternatively, latching pushbutton switches are usually double pole, double throw (DPDT) switches. These switches are normally closed, meaning that the circuit is closed when the button is released. Pushbutton switches can also be configured as normally open, normally closed, or both, depending on the application.

Some pushbutton switches also have a built-in diode, which helps protect the circuit from voltage spikes caused by the rapid switching of the contacts. This helps ensure that the switch has a longer operational life.

Pushbutton switches can be used in low voltage and AC circuits. They are commonly used in microprocessor-based controllers, such as PLCs and industrial computers. Pushbutton switches are also commonly used in household appliances and emergency stop (E-stop) switches.

Conclusion

Pushbutton switches are versatile electrical components which can be used in a wide variety of applications. They are commonly used to control lighting, appliances, industrial processes, and robotic equipment. Pushbutton switches are usually SPST or DPDT switches, and they can be configured as normally open, normally closed, or both. Pushbutton switches may also have a built-in diode to protect the circuit from voltage spikes.

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