Garage door reed switch SATEL B-4S (metal) — magnetic contact sensor for control systems

SATEL B-4S is a compact metal-body reed switch designed as a magnetic contact sensor for garage door and gate control systems. It provides a reliable closed/open contact signal to security and automation panels to detect door or gate position and to monitor end-of-travel. The metal housing increases mechanical durability and helps protect the sensor in sheltered outdoor or indoor installations where a small, robust magnetic sensor is required.

Advantages

The metal enclosure offers enhanced resistance to impact and mechanical wear compared with plastic housings while keeping a compact footprint for discreet installation. The reed contact provides a simple and low-power switching signal compatible with standard control and alarm panels. The device’s design supports straightforward mounting on garage doors, gates, or frames and ensures consistent position detection for automation and security applications.

Suitable for

• Monitoring garage door open/closed position
• Detecting gate end-of-travel for automatic gate systems
• Integrating with alarm panels and access control systems
• Indoor or sheltered outdoor installations where a compact magnetic sensor is needed

Key specifications

• Sensor type: magnetic reed switch (normally open / normally closed contact depending on wiring)
• Housing material: metal for enhanced mechanical protection
• Signal output: simple dry contact suitable for control and security inputs
• Mounting: surface-mountable compact design for doors, gates or frames
• Environment: intended for indoor and sheltered outdoor use

How to use

Install the metal reed switch on the fixed frame and the magnet on the moving part (door or gate) according to alignment guidelines so the magnet actuates the reed contact at the desired end-of-travel position. Connect the switch’s dry contact leads to the appropriate input of the control, alarm, or automation panel following the panel manufacturer’s wiring diagram and electrical safety rules. Verify correct operation by moving the door or gate through its range and confirming the control panel registers open and closed states at the expected positions.

Usage recommendations

Place the sensor in a sheltered location protected from direct weather exposure where possible, and avoid mounting on parts subject to heavy mechanical interference. Use corrosion-resistant mounting hardware and route wiring to minimise exposure to moisture and mechanical abrasion. Test contact operation periodically as part of routine maintenance for gate and garage door control systems.