Reed Switch (cylindrical) No name KN-06C — magnetic contact sensor, normally open

Cylindrical reed switch No name KN-06C is a compact magnetic contact sensor that detects the presence or absence of a magnetic field. Housed in a small cylindrical body, the device contains a normally open reed contact that closes when an external magnet approaches. It is designed for basic proximity detection and door/window monitoring where a simple, low-cost magnetic switch is required.

Advantages

The cylindrical design provides an easy-to-mount form factor for narrow or recessed installations. A normally open contact ensures the circuit remains open until a magnet is present, simplifying wiring for many alarm and detection circuits. The sensor operates without power for the switching element itself and offers reliable mechanical switching behavior suitable for long-term basic monitoring tasks.

Suitable for

• Door and window open/close detection in alarm and security systems
• Cabinet and enclosure position sensing
• Simple proximity detection in access panels and sliding elements
• Low-power or passive switching applications where a magnet can be mounted opposite the sensor

Key specifications

• Form factor: cylindrical housing suitable for flush or surface mounting
• Contact type: normally open (NO) reed contact
• Activation method: external permanent magnet proximity
• Typical use environment: indoor installations such as doors, windows, cabinets
• Connection: two-wire termination for simple series or monitoring circuits

How to use

Install the cylindrical reed switch on the fixed frame adjacent to the moving element (door, window, or panel) so that the external magnet can align with the switch when the element is closed. Secure the sensor in place using appropriate fasteners or adhesive suitable for the installation surface. Connect the two wires into the alarm or monitoring circuit following the system wiring diagram, observing polarity only if the system requires it. Test the installation by bringing the magnet close to the sensor to verify the contact closes and moves away to verify it opens.

Usage recommendations

Position the magnet and sensor with consistent alignment and a small gap to ensure repeatable activation. Avoid mounting near strong electromagnetic interference sources or high-voltage conductors. For outdoor or moisture-exposed installations, use additional sealing or an appropriately rated enclosure to protect the sensor and connections.