Reed Switch / Side Contact Sensor No name KN-CA51 — KN-CA51

KN-CA51 is a compact side-contact magnetic reed switch sensor by No name, designed to detect opening or movement through interruption of a magnetic field. The sensor is intended for flush mounting in door or window frames where a discreet profile and side contact position are required. KN-CA51 supports simple normally open (NO) or normally closed (NC) wiring configurations and is suitable for basic alarm systems and security sensor applications in residential and light commercial settings.

Advantages

The KN-CA51 offers a small footprint that allows near-flush installation in narrow frame profiles while maintaining reliable magnetic switching detection. Its side-contact design enables flexible positioning relative to the magnet, and the sensor’s compatibility with NO and NC circuits simplifies integration with a wide range of alarm control panels and wired security setups. The construction is designed for straightforward wiring and mounting, reducing installation time in retrofits and new installations.

Suitable for

• Door contact for home security systems
• Window contact in residential buildings
• Perimeter sensing in light commercial premises
• Basic magnetic detection for alarm panels and control units

Key specifications

• Sensor type: side-contact magnetic reed switch
• Contact modes: normally open (NO) and normally closed (NC) wiring compatible
• Mounting: flush or semi-recessed installation in door/window frames
• Typical use: wired security and alarm input sensor
• Form factor: compact profile suitable for narrow frame gaps

How to use

Install the KN-CA51 into the door or window frame so the side contact faces the mating magnet attached to the moving sash or leaf. Route and connect the sensor wires to the alarm control panel following the required normally open or normally closed configuration for your system. Adjust the magnet position to achieve consistent activation and deactivation across the expected movement range. Ensure the sensor body is secured and any cable entries are protected against mechanical strain or moisture as required by the installation environment.

Usage recommendations

For reliable operation, test the sensor after mounting to confirm proper alignment with the magnet and stable switching across the full opening and closing movement. Use the sensor in dry, protected locations or provide appropriate sealing where exposure to moisture or dust is possible. Match the contact mode (NO/NC) to your alarm panel’s monitoring scheme and adhere to local wiring standards when routing cables and terminating connections.