1241.8451

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1241.8451 Pushbutton Switches - Application Field and Working Principle

Pushbutton switches are one of the most widely used electrical devices in the world today. They are used in numerous applications and are known for their capability of switching electrical components on and off. Generally, pushbutton switches are classified into four main categories; Momentary Action, Maintained Action, Changeover Action, and Non-Latching. Every type of pushbutton switches comes with its own application fields and its own working principle.

Application Field

The application fields of pushbutton switches depend on the type of pushbutton switch. Momentary action pushbutton switches are typically used to perform switch operations of short duration. Its typical applications are circuit interrupting, starting and stopping motor applications, operating relays or holding clamps in position. Meanwhile, maintained action pushbutton switches are used to retain a circuit condition until it is manually reset. Changeover action switches are used to switch between a pair of contacts, while non-latching pushbutton switches are used in safety-related applications where constant monitoring feedback is necessary.

Working Principle

The working principle of a pushbutton switch can be summed up in two simple concepts. First, the user applies a force to depress the button, which snaps the plunger into place. Second, the force of the plunger either opens or closes the circuit, depending on the type of pushbutton switch. This principle applies to all pushbutton switches, regardless of their type.

Momentary action pushbutton switches utilize a spring-return mechanism that allows the user to open or close the circuit by depressing or releasing the button. When the button is depressed, a locking mechanism secures the connection and the circuit remains closed until the button is released. This allows for momentary action such as toggling a circuit for a very short period of time. Maintained action pushbutton switches on the other hand, open when the button is depressed and remain open until the button is depressed again. Meanwhile, changeover action switches open one circuit when the button is depressed and close another one when it is released. Non-latching pushbutton switches do not stay in their "on" position when the button is released and are used for safety-related applications as they provide instant feedback.

In conclusion, while there is a number of different types of pushbutton switches, they share the same working principles. Depending on what type of pushbutton switch is used, its application field may vary. It is important to consider the type of application when selecting a pushbutton switch as it will affect its performance and its lifespan.

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