Reed switches are devices commonly used for position sensing and control applications. One important aspect is their actuation distance, which determines how close a magnetic field needs to be in order to actuate the Reed Switch.

The actuating distance of a reed switch is typically specified as the distance between the switch and a magnet required for the switch to close. The actuation distance is influenced by various factors, such as the strength of the magnetic field or Magnet, the magnetic sensitivity (AT Band) of the reed switch, and the surrounding environment.

A stronger magnetic field will increase the operating distance of a reed switch. This means that a switch will close even when the magnet is further away if the magnetic field is stronger. On the other hand, a weaker magnetic field will require the magnet to be closer to the switch in order to trigger it.

The physical characteristics of a reed switch also play a role in determining the actuation distance. This includes factors such as the length and thickness of the reeds which fix the flexibility, as well as the gap between them. Generally, reed switches with smaller gaps will have wider actuation distances.

The environment in which the reed switch is placed can also affect its actuation distance. Factors such as temperature, humidity, and vibration can influence the performance of the switch. For example, high temperatures may increase the AT band of the Reed Switch, which can increase the actuation distance, as well as weaken the strength of the actuating magnet.

It is important to consider the actuation distance when selecting a reed switch for a particular application. Choosing a switch with the correct actuation distance ensures reliable operation and accurate sensing. Additionally, understanding the factors that affect actuation distance allows for proper installation of the reed switch.

In conclusion, actuation distance is a crucial factor in the performance of reed switches. By considering factors such as the strength of the magnetic field, physical characteristics of the switch, and the environment, one can select the most suitable reed switch for their application, leading to optimal performance and reliability.

Most Reed Switch applications use magnets and for making AT band and Actuating Magnet Selection easier, we have listed various combinations of operating distances and corresponding magnets. Selecting the right AT band and magnet for an application is important and can be done by going through our AT band Selection guide and our magnet selection guide.