Reed Switch Door Contact KN-D4 by No name — KN-D4 magnetic door sensor

The KN-D4 reed switch door contact by No name is a compact magnetic sensor designed for detection of door and window open/close states in alarm and security systems. The device implements a reed switch arrangement with normally-open and normally-closed operation options, allowing straightforward integration with a wide range of control panels. Its small size enables mounting on door and window frames and sashes where it provides reliable state change signaling for intrusion detection and access monitoring.

Advantages

The KN-D4 offers a simple mechanical design that provides dependable contact switching and low power consumption. Its compact form factor allows installation in tight profiles and on different types of frames without significant visual impact. The magnetic operation ensures silent switching and minimal mechanical wear, supporting long-term reliability in typical residential or light-commercial security installations.

Suitable for

• Wired alarm and security control panels
• Door and window open/close state monitoring
• Perimeter intrusion detection in homes and small offices
• Integration into access control systems for basic door status sensing

Key specifications

• Operating principle: magnetic reed switch with NO/NC configurations
• Mounting: surface mount on frame and sash
• Form factor: compact inline sensor and magnet components suitable for standard door and window installations
• Connection: wired contact terminals for integration with alarm panels
• Switching type: mechanical reed contact actuated by a magnet

How to use

Position the sensor and magnet so that they align when the door or window is closed, maintaining the recommended gap specified by the installer’s guide. Secure each component to the frame and sash using appropriate screws or adhesive pads compatible with the mounting surfaces. Connect the sensor’s wired terminals to the alarm or control panel input, observing correct NO/NC configuration required by the system. After installation, test the sensor by opening and closing the door or window to verify that the control panel registers state changes correctly.

Usage recommendations

Install the KN-D4 away from large ferrous metal obstructions and strong electromagnetic sources that could affect magnetic operation. Use correct wiring and terminal connections to match the control panel’s input type (normally-open or normally-closed). Periodically check mounting integrity and contact alignment to ensure consistent performance.