Door Contact Sensor KN-CA59 — No name, model KN-CA59, reed switch magnetic contact

Wired door contact sensor KN-CA59 is a compact magnetic reed-switch contact intended for monitoring the open/closed state of doors and windows. The sensor set includes a fixed sensor body and a magnet; when the magnet moves away from the sensor, the internal reed switch changes state to indicate an open contact. The KN-CA59 is designed for wired connection to alarm control panels, security systems and access control equipment for perimeter and intrusion detection in residential and commercial installations.

Advantages

The KN-CA59 provides a simple and reliable method of detecting door and window openings using a magnetic reed switch and a compact form factor that is easy to install. Its wired design eliminates battery maintenance, and the sealed housing offers basic protection against dust and everyday handling. Compatibility with standard alarm inputs and straightforward wiring make it suitable for retrofit projects and new installations where a wired contact is preferred.

Suitable for

• Wired alarm and security panels
• Residential door and window intrusion detection
• Commercial perimeter monitoring (offices, shops, warehouses)
• Integration with access control systems as door state input
• Retrofit installations where a low-profile magnetic contact is required

Key specifications

• Type: Wired magnetic reed-switch door/window contact
• Form factor: Two-part sensor and magnet set, surface-mount
• Operating principle: Normally closed / normally open reed contact (changes state when magnet separates)
• Connection: Low-voltage wired terminals for alarm panel input
• Mounting: Surface-mounted on door/window frame and sash
• Material: Durable plastic housing suitable for interior use
• Environmental suitability: Indoor use; designed for typical residential and commercial environments

How to use

Mount the sensor body on the fixed frame and the magnet on the moving part (door or window) so that the two parts align when closed. Connect the sensor’s wires to the corresponding input terminals on the alarm panel or access control unit following the system manufacturer’s wiring diagram and voltage requirements. Test the contact by opening and closing the door or window and verifying the expected state change on the control panel. Secure wiring and use adhesive or screws according to mounting surface and installer preference.

Usage recommendations

For reliable performance, align sensor and magnet within the recommended gap (typically a few millimetres) and avoid mounting on highly magnetized or electrically noisy surfaces. Use the KN-CA59 with compatible low-voltage alarm inputs and protect wiring from mechanical damage. For exterior-exposed locations or harsh environments, consider weatherproof housings or a contact specified for outdoor use.