Magnetic Contact Sensor SATEL B-3CS cylindrical reed switch for door/window monitoring

Magnetic Contact Sensor SATEL B-3CS cylindrical reed switch for door/window monitoring is a compact magnetic contact designed for integration with alarm and access control systems. The cylindrical construction houses a reed switch and a magnet, enabling detection of opening and closing events. The device can be configured for normally closed (NC) or normally open (NO) operation depending on how the two parts are installed, and its small size makes it suitable for flush or concealed mounting in door and window frames or profiles.

Advantages

The cylindrical form factor allows discreet placement inside frames and profiles while maintaining reliable contact operation. The reed switch principle ensures low current consumption and long service life with minimal maintenance. Being configurable as NC or NO provides flexibility for different alarm panel inputs and wiring schemes. Its simple two-part design facilitates straightforward installation and alignment for consistent detection.

Suitable for

• Monitoring doors in residential and commercial alarm systems
• Detection of window opening in security and access control installations
• Concealed installation inside door or window profiles for aesthetic integration
• Replacement or upgrade of existing reed-type magnetic contacts

Key specifications

• Sensor type: cylindrical reed magnetic contact
• Operation modes: configurable for normally closed (NC) or normally open (NO)
• Mounting: flush or concealed installation in frames and profiles
• Construction: two-part contact and magnet assembly in compact cylindrical housing
• Compatibility: designed for integration with standard alarm and access control panels

How to use

Install the two cylindrical parts so that the magnet aligns with the reed switch when the door or window is closed. Choose wiring that corresponds to the required NC or NO configuration and connect the switch leads to the appropriate input on the alarm or access control panel. Ensure proper alignment and gap clearance according to the mounting location to guarantee reliable triggering. After mounting, test the sensor by opening and closing the door or window to verify signal changes at the control panel.

Usage recommendations

Place the sensor parts in clean, dry frame recesses and avoid excessive gap between magnet and contact to maintain stable operation. Regularly inspect mounting for loosening or corrosion in environments with high humidity or pollutants. Use compatible panel inputs and, if required, consult system documentation for end-of-line resistor placement or tamper monitoring integration.