Feature: Switches
Tey are oſten of simple design and inexpensive, and offer direct
haptic feedback, making operation easy and intuitive. Mechanical switches can switch high currents, making them
suitable for applications that require high current carrying capacity, like industrial or light switches. However, mechanical switches wear and tear more easily, which limits their service life. In addition, phenomena like contact bounce can occur, in which the rapid opening and closing of the contacts leads to undesirable electrical interference.
the switching. Te technology is very robust since it contains no moving parts, making it suitable for applications that require high reliability and durability. Piezoelectric switches are resistant to mechanical stress and
Schurter MSS: Electronic
switch with ring illumination and protection class IP6K9K
environmental influences, and suitable for waterproof designs. Tey are found in medical systems, industrial plants and outdoor applications. However, they are more expensive to manufacture and provide lower haptic feedback than mechanical switches.
Electronic switches Electronic switches (see image above) use semiconductor components like transistors or thyristors to control the flow of current. Tey contain no moving parts and are controlled by electrical signals, enabling high switching speeds and long service life. Electronic switches are noiseless, making them ideal for digital
applications where fast and reliable switching is required, as in computers and smartphones. However, they can be sensitive to overvoltages, electromagnetic interference and high temperatures, and leak current when switched off. Tey oſten require additional circuits for control.
Schurter CPS: Capacitive
switch with ring illumination in metal housing
Capacitive switches Capacitive switches (see image above) detect changes in the electrical field when a conductive object, such as a stylus or a finger, comes in proximity. Physical contact is not even necessary, which makes this technology particularly suitable for applications where hygiene and design play a crucial role. Tey enable flat and seamless surfaces, making them ideal for touchscreens, household appliances and modern control panels. However, among their disadvantages are sensitivity to moisture and
Schurter PSE: Piezoelectric switch for use in harsh environments
dirt, which can lead to operating errors. Tey also require permanent monitoring of the electrical field, and consume more energy.
Piezoelectric switches Piezoelectric switches (see image above) harness the piezoelectric effect, where specific materials generate electrical voltage when subjected to mechanical pressure; the generated voltage triggers
Inductive switches Inductive switches work on the principle of electromagnetic induction, detecting metallic objects through changes in a generated magnetic field. Tey are wear free and insensitive to environmental conditions like dirt, dust and moisture. Because of these properties, they are oſten used in automation and industrial applications; for example, for position sensing or as safety sensors. On the flip side, however, their range is limited and they can only detect metallic objects, which reduces their use.
www.electronicsworld.co.uk September 2025 23
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