Introduction
In scenarios such as elevator operation, industrial production, and vehicle driving that are crucial for life safety, although the micro switch may seem insignificant, it plays the role of an "invisible defense line". To ensure its flawless performance in safety-critical systems, the industry has established strict certification standards, ensuring that each switch can withstand safety tests.
The elevator safety circuit is the "bolt" that guards the up and down movement.
In the elevator safety circuit, the micro switch is an important "bolt". When the elevator door is not fully closed or the car exceeds the limit position, the corresponding micro switch will immediately disconnect the circuit and force the elevator to stop running. For example, in the locking devices of the floor door and car door, the micro switch can precisely detect whether the door is fully closed. As long as there is a slightest gap, it will trigger safety protection. Such switches must pass rigorous tests to ensure they do not fail after tens of thousands of door opening and closing operations, building a safety barrier for every passenger in the elevator.
Industrial safety door locks are the "gatekeepers" against accidental operations.
In factories, safety door locks with micro switches are the "gatekeepers" against accidents. When the equipment is running, as long as someone tries to open the protective door, the micro switch will quickly cut off the power supply and make the equipment stop urgently to prevent the operator from being injured by the high-speed rotating components. The force value and response speed of these switches have strict regulations, and they must react within milliseconds to add "double insurance" to industrial production.
Automobile safety systems are the "transmitters" of braking signals.
Brake light switches, safety airbag linkage switches, etc., are all key micro switches for ensuring driving safety. When braking, the brake light switch instantly transmits a signal, illuminating the brake light and triggering the ABS system; the micro switch of the seat position sensor will adjust the pop-up force of the safety airbag according to the passenger's sitting posture. The stability of these switches directly affects vehicle safety. If they fail, it may cause accidents such as rear-end collisions and accidental airbag explosions. Therefore, their reliability requirements are extremely high.
Safety certification is a "double insurance" for reliability.
To ensure the reliable operation of micro switches in safety-critical systems, there are authoritative standards such as ISO 13849 and IEC 61508. These standards are like "exam outlines", setting strict indicators in terms of the lifespan of the switch, anti-interference ability, and adaptability to extreme environments. During the certification process, the switches must undergo multiple tests such as high temperature, vibration, and dust, for example, in ISO 13849 certification, the switches need to pass millions of cycle tests to prove that they will not suddenly fail in long-term use. Only products that pass the certification can be used in safety-critical systems.
Conclusion
Micro switches in safety-critical systems use precise actions to safeguard life and production safety. The strict certification standards add "double insurance" to their reliability, ensuring that each trigger is precise and error-free. With the improvement of safety awareness, these small switches will continue to stand guard in the invisible battlefield and become indispensable reliable forces in the safety system.
Post time: Jul-29-2025
