What Does a Switch Contain?

The Main Components of a Mechanical Switch
🔹 Housing
Protects and supports the internal components of the switch.
Usually made from durable plastic (PC, POM, or Nylon).
There are two parts:
Upper casing – affects the stability and sound of the switch.
Lower casing – contains the electrical contacts and influences the type of mounting (PCB or on board).
🔹 The Stem (Rod or Piston)
Mobile component that is pressed with each keystroke.
Determine the type of switch:
Liniar – moves without interruptions.
Tactil – is a small obstacle at the activation point.
Clicky – produces a "click" sound in addition to tactile feedback.
The shape and design of the stem affect the feel when pressed and the noise produced.
🔹 Arch (The Spring)
Control the force required for key press and its return to the initial position.
Made of metal and varies in hardness (measured in grams of force - gf).
Stiffer springs require more pressure to press the key, providing a faster return.
🔹 Contact Leaf (Metal Leaf)
This metal component is responsible for closing the circuit and sending the signal to the computer.
It is located at the bottom of the casing and is activated when the stem reaches the contact point.
The material used influences the accuracy and durability of the switch.
🔹 Rubber Dome (in some special switches)
'Used in Topre or hybrid switches, helping to dampen sound and create a unique typing feel.'
"Acts similarly to a membrane, but offers a more premium experience compared to classic membrane keyboards."
🔹 Noise Dampers (optional)
Some silent switches include silicone or other soft material dampers to reduce noise during pressing and returning.
They are mainly used in office environments or for typing sessions without excessive noise.
How Does a Mechanical Switch Work?
Pressing the key – The stem descends and compresses the spring.
Activating the contact – When the stem reaches the activation point, the contact leaf closes the circuit and the signal is sent to the computer.
Releasing the key – The spring pushes the stem back to its original position.
Resetting the circuit – The contact leaf opens and the switch is ready for a new press.