Micro switch (mechanical), as the name implies, is a switch that uses very small force. It operates by an external mechanical force acting on a movement spring through transmission elements, causing the stationary contact at its end to quickly connect or disconnect with the moving contact. Covered by a case, this type of switch has an external driving rod and is named micro switch (mechanical) because of the small distance between its contacts. It's also known as a sensitive switch, which is a fast switch activated by applying pressure.
In our daily lives, there are many products that require the control of micro switch (mechanical), such as computer mice, automotive electronics, communication devices, military products, testing instruments, gas water heaters, gas stoves, small appliances, microwave ovens, rice cookers, float equipment, medical instruments, building automation, power tools, general electrical and radio equipment, 24-hour timers, etc.
The characteristics of micro switch (mechanical) include small contact spacing, short operating stroke, low actuation force, and rapid on/off switching. Moreover, the speed of the moving contact's action is independent of the speed of the transmission element's action. These traits make micro switch (mechanical) suitable for scenarios requiring fast and precise control of circuit connectivity.
At the current stage, the lifespan of micro switch (mechanical) on the market, depending on the usage scenario, ranges from hundreds of thousands to millions of cycles. Among these, the spring responsible for conduction is the most frequently moving and also the most critical component. If the spring undergoes plastic deformation or fatigue, it may lead to device failure, so material reliability is very important.
Tensile strength measures a material's ability to withstand fracture under tensile force. For micro switch (mechanical), the tensile strength of their materials directly affects the mechanical life of the switch. Materials with high tensile strength can endure more mechanical stress cycles, thus extending the switch's service life. In the design of micro switch (mechanical), metals or alloys with high tensile strength, such as stainless steel and copper alloys, are usually chosen to ensure that the switch does not easily fracture or fail due to fatigue during prolonged use.
Yield strength, also known as yield point, is the stress at which a material begins to deform plastically under external force. In micro switch (mechanical), yield strength is directly related to the switch's depression rebound performance. Materials with good yield strength can quickly return to their original shape after being subjected to external force, ensuring accurate reset and reliable operation of the switch. Therefore, the key components of micro switch (mechanical), such as contacts and springs, are usually made of materials with high yield strength to ensure the stability and reliability of the switch.
Impedance is the resistance encountered by an electric current in a circuit. For micro switch (mechanical), impedance mainly affects the quality of signal transmission when the switch is turned on and off. Low-impedance materials can reduce the attenuation and distortion of signals during transmission, improving the switch's response speed and accuracy. In the contact materials of micro switch (mechanical), materials with high conductivity and low contact resistance, such as gold, silver, or their alloys, are typically chosen to ensure that the switch can quickly and accurately transmit electrical signals when turned on. Additionally, to further improve signal transmission quality, contact surfaces may be specially treated, such as gold plating or silver plating, to reduce contact resistance and prevent oxidation of the contacts.
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