Kontaktron to the door

A door reed switch is a small device that acts as an open and close sensor. It consists of two parts: one that is mounted on the moving part of the door, and the other that is attached to the door frame. When the two parts are close together (the door is closed), the electrical circuit remains closed. When the door opens, these parts separate, which breaks the circuit and triggers an alarm signal or information about the door opening.

Reed switches are often used in alarm systems and access control systems, helping to monitor the security of facilities. They are relatively simple to install and offer reliable performance, making them a popular choice for home, office or other building security. They can also be used in home smart systems to automatically control lighting or other devices, depending on whether the door is open or closed.