Magnetic Contact Sensor SATEL B-3CM cylindrical reed switch for doors and windows

The SATEL B-3CM magnetic contact sensor is a cylindrical reed switch designed for monitoring doors and windows in wired alarm and security systems. Its compact cylindrical form factor allows installation inside door or window frames and profiles where space is limited. The sensor operates by detecting changes in the magnetic field when a magnet-equipped sash or leaf moves relative to the switch, providing a reliable signal for intrusion detection and status monitoring.

Advantages

The cylindrical design enables discreet installation flush with most frames and profiles, minimizing visible components. As a reed switch-based contact, it delivers simple and robust operation with low power consumption and long service life. The sensor supports normally closed or normally open wiring configurations, making it compatible with a wide range of alarm control panels and wiring layouts. Its mechanical simplicity reduces maintenance needs and improves reliability in typical residential and commercial environments.

Suitable for

• Monitoring doors in residential or commercial installations
• Monitoring windows, skylights, and other opening elements
• Applications requiring concealed or flush-mounted contacts inside frames or profiles
• Integration into wired alarm systems and access control zones

Key specifications

• Form factor: cylindrical reed switch suitable for frame or profile mounting
• Operation principle: magnetic reed contact (mechanical switch actuated by magnet)
• Wiring: supports normally closed (NC) or normally open (NO) configurations
• Installation: designed for concealed or flush mounting in door/window frames
• Applications: wired intrusion detection for doors and windows

How to use

Install the cylindrical reed switch into the designated hole or recess in the door or window frame so that the switch and its magnet counterpart align when the opening is closed. Connect the sensor wiring to the alarm control panel according to the required normally closed or normally open configuration and secure the wiring to prevent mechanical stress. Verify alignment and test the sensor by opening and closing the door or window while observing the control panel or a multimeter to confirm correct state changes.

Usage recommendations

Place the reed switch where the magnet will pass closely and consistently to ensure reliable actuation. Avoid mounting locations exposed to strong external magnetic fields or mechanical vibrations that could cause false triggers. Use appropriate sealing or grommets in outdoor or damp environments to protect wiring and contacts, and verify compatibility with the alarm panel input type before final connection.