Feature: Switches


Schurter THS: Contactless switch with ToF technology for descreet installation


Most suited for the application Selecting the optimal switch technology for a specific application (see Table 1) is a complex process that should involve many considerations: It is not only about understanding the technical specifications of the switches, but also about meeting the requirements of the application, the environmental conditions and end user expectations. The first step is to analyze the application – industrial


applications have different requirements than consumer goods or medical devices. In industry, factors like ruggedness, reliability in extreme conditions and high switching cycles can be critical. In consumer goods, design, ease of use and cost are often more important. The environmental conditions in which the switch will


Contactless switches There are also contactless switches (see image above), based on technologies that include infrared, ultrasound or capacitive proximity sensors. They provide significant advantages in terms of hygiene, durability and ease of use, but are costlier and can be sensitive to dust and moisture. Among their applications are medical facilities and public areas for hygiene purposes, consumer goods for ease of use, and industry for wear and reduced contamination. These switches offer system designers more choices, such as slim, modern designs that can also be integrated behind surfaces like glass or plastic. Among their disadvantages, however, are their sensitivity to


dust and moisture, which can lead to unintentional triggering. If required in applications for continuous operation, they will need a continuous power supply, which is wasteful of energy. Another issue is their integration complexity, which requires


additional electronics, and can make maintenance and repair more difficult.


operate will also dictate the choice. In humid or dusty environments, non-contact technologies like capacitive or inductive switches are advantageous since they are less susceptible to wear or malfunction. For outdoor applications or areas with extreme temperatures, piezoelectric switches may be the best choice since they are resistant to environmental influences. The expected life and number of operations of the switch


are also important criteria. Applications requiring millions of operations benefit from technologies without mechanical wear parts, such as electronic or piezoelectric switches. Mechanical switches may be less suitable due to wear and possible contact problems. Available budgets and the cost structure of the project also


influence the decision. Mechanical switches are generally cost- effective and suitable for price-sensitive applications. High-end technologies such as piezoelectric or special electronic switches can be more expensive, but offer advantages that justify their higher price. In applications where user interaction is paramount, aspects


like tactile feedback, ease of use and design are crucial. Mechanical switches offer direct tactile feedback, whereas capacitive switches allow modern, low-profile designs and can be installed under glass or plastic surfaces, making them attractive for highly stylised products. In safety-critical applications, switches have to meet


additional requirements. Reliability, fault-free operation and, often, redundant systems are required here. Electronic switches can be equipped with additional safety functions, whilst mechanical switches are preferred in certain cases due to their simplicity.


Table 1: Suitability of switch technology for an application


Switch developments Switch technology is constantly evolving, driven by new materials, advances in semiconductors and increasing demands for energy efficiency, miniaturisation and functionality. One type of switch that is increasingly becoming important is the intelligent switch, with integrated sensors and communication capabilities.


24 September 2025 www.electronicsworld.co.uk


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