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How does a latching push button switch work?

by Huyu 15 Feb 2023 0 Comments

Switches are split into the latching and non-latching categories based on how well they work and how much current they can carry. Different types of switches, like the  Normally Open, Normally Closed, Latching push buttons, and Momentary, among others, fall under these categories. 

If you press a latching push-button and hold it down, it will stay in that position until you touch it again; a feature is known as "latching" or "maintained." You will have to do several clicks or touches to activate or deactivate the function. A latching push switch works to create and break a cycle through a simple push. Read on for more on how a latching push button works.


What Is a Latching Push Button Switch?


Multiple sizes and shapes of latching push button switches are commercially available. You are sure to see one wherever machinery control is needed. A Latching push button switch is a device that remains "latched" in the "on" position until its power source is cut off.

Latch switches continue to function after the triggering button has been activated, meaning it remains active until all power is gone. Even though pressing the button is supposed to release a latch, it has no impact.


How Do Latching Push Buttons Work?


Latching switches turn on in response to pressure being applied to them and remain on until the user presses them again. This means that once the operator flips these switches on, they will remain on until manually deactivated.


Latching Push Buttons In Circuits


In circuits, latching push buttons are used extensively because they are integral to the operation of many devices. Consider the most common uses for alarms, which typically feature a latch. As long as the alarm is activated, it will continue to sound until the system is turned off, which is evident in most alarm systems, whether for burglary or fire.

A silicon-controlled rectifier is the most common latching device used in electronic circuits. Three-terminal SCRs alter electrical currents in response to an applied voltage, while the anode, cathode, and gate make up these components.

If the gate voltage is high enough, the SCR will "trigger on," allowing current to flow from the circuit's cathode to the anode. The gate voltage of the SCR is no longer affected by its turned-off state or changed in any other way as the SCR stays on.

A push-to-make latching switch completes a circuit. A second button press interrupts the circuit and shuts off the electric current. These standard switches are also referred to as normally closed. The action of a push to break latching switches is reversed. Once you press it, it deactivates the electrical circuit and can be restored by pressing the button again.

What Is a Latching Switch Used For?

The light switch is the most well-known use for a latching switch. If you push the light switch in once, the lights will remain on without further action. Other common applications include;

  • Loading machines
  • Household appliances
  • Medical equipment
  • Electronic control systems
  • Hospitality appliances
  • HVAC
  • Security equipment


Advantages Of Latching Push Button Switches

The following are some of the benefits of the latching switch;

  • Latching push button switches can support a lot of weight.
  • They are secure, durable, and efficient.
  • They are small and lightweight.
  • Save time
  • They are an upgrade from traditional crossbar switches.
  • They offer you control
  • They ensure proper machinery function


Voltage Requirements for Latching Push-Button Switches

A push-button switch should automatically work efficiently, but checking the maximum load the circuit can handle is essential. You can check the AC-DC capacity difference while looking for a latching push button. Manufacturers are required to label it on the switch clearly.

AC or DC transmission is determined by how quickly a circuit breaks. When the inductive load switches, it affects the electrical load.


Take Away

Compared to a regular switch, a latching switch is preferred since it prevents you from constantly standing by the light or equipment to keep it on. Low-threat situations, or those in which holding down a switch indefinitely would be cumbersome or unsafe, are suitable applications for latching switches. When selecting a latching push button switch, think about its intended use.

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