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Commercial door contacts are essential for maintaining security and monitoring access in businesses. Selecting the right type ensures reliable operation, accurate alerts, and seamless integration with your existing security system. Proper selection significantly impacts the effectiveness of your security measures.
Heavy Duty Housing: Zinc alloy magnetic contact sensor built for garage doors and roller shutters; metal construction of garage door magnetic contacts supports repeated use in residential or commercial door setups
Wired NC Contact: Normally closed wired magnetic switch rated up to 100VDC 0.5A 10W; garage door sensor suitable for low-voltage alarm circuits, access control, and automation systems
Adjustable L Bracket: Includes adjustable L bracket for flexible positioning; magnetic garage door hardware helps align the magnet and switch on garage doors, shutters, and other moving door panels
Complete Mounting Set: Includes magnetic switch, magnet piece, adjustable bracket, and mounting screws; garage door parts is practical for replacement, upgrade, or new installation projects
For Door and Shutter Systems: Designed for garage doors, roller shutter doors, and similar entry systems; integrates with compatible wired magnetic gate contact sensor and alarm setups
Package content: You will receive 6 pieces of brown surface-mounted magnetic door switch. The rich quantity can perfectly meet your daily needs and applications. Contact type: NC; Action distance: 15-20 (mm); Working voltage: 100V; Working current: 0.5A.
Preferred material: The wired reed switch is made of high-quality ABS plastic, which is durable, heat-resistant and cold-resistant, and has a longer service life.Fine workmanship, simple and generous, is the best choice to protect the safety of your doors...
NC type: NC stands for normally closed. If the magnet and the switch are combined, the circuit will conduct electricity; if the magnet and the switch are separated, the circuit will not conduct electricity. Wired reed switch and wire connection alarm...
Widely used: Reed switches are very suitable for installation in windows, cabinets, drawers, doors, etc.
Product packaging:The screws are packaged in a separate PE bag with 80 screws, making the installation more efficient and convenient.
Material: ABS made of high strength, good heat resistance plastic, the surface is covered with double-sided tape, can be better applied to home, office and many other places
Usage scenario: Available on plastic, glass and wood doors and Windows, this surface-mounted door sensor is suitable for use in many public places.
Operating principle: NC means normally closed; If the magnet is closed to this switch, the signal is conductive, otherwise, if the magnet is far away from this switch, the signal is disconnected; This working principle is ideal for alarms, LED, door...
NC MAGNETIC CONTACT SENSOR: Surface-mounted wired magnetic door/window contact sensor (MC-31, NC). Magnet close = circuit conductive; magnet separated = circuit disconnected—ideal for wiring into security alarm loops.
8MM ACTUATION GAP: Designed for an actuation distance of 8mm ±18mm to help maintain reliable open/close detection during everyday door and window movement; suited for common home security system wiring.
SURFACE-MOUNT FOR QUICK RETROFIT: Screw-on design for fast installs on doors, windows, cabinet doors, and storage rooms—use for perimeter monitoring where recessed/drilled contacts aren’t convenient.
MATCHED HOUSING & HARDWARE: White plastic housings blend with frames; mounting hole diameter 5.8mm. Set includes 20 sensor/magnet pairs plus 80 screws to equip multiple openings in one project.
INSTALLATION NOTES: Keep the sensor and magnet aligned and on the same plane; verify the gap stays within the actuation range across the full swing. Package includes 20 sets (64×12×12mm & 64×20×12mm) and screws.
Last update on 2026-08-31 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Commercial Door Contacts
Understanding Types of Door Contacts
Wired Contacts: These are the most traditional and reliable option, requiring a physical connection to your alarm system. They are less susceptible to interference and generally offer a longer lifespan.
Wireless Contacts: Offering greater installation flexibility, wireless contacts communicate with the base station via radio frequency. They are ideal for retrofitting older buildings or when running wires is impractical.
Surface Mount vs. Recessed Mount: Surface mount contacts are installed on the door frame and door surface, making them easier to install. Recessed mount contacts are installed within the door and frame for a cleaner, more discreet appearance.
Key Features to Consider
Contact Type: Most commercial contacts are magnetic reed switches, but some use roller or mercury switches. Reed switches are common due to their simplicity and reliability.
Gap Distance: This is the maximum distance the two parts of the contact can be separated before the alarm is triggered. Ensure this distance is appropriate for your door and frame tolerances.
Tamper Protection: Some contacts include a tamper switch that triggers an alert if the device itself is tampered with, adding an extra layer of security.
Environmental Ratings: Consider if the contact needs to withstand extreme temperatures, moisture, or dust (e.g., outdoor or industrial settings). Look for appropriate IP ratings.
Installation and Compatibility
Wired Systems: Ensure the contact's voltage and current ratings are compatible with your existing alarm panel or control system.
Wireless Systems: Check the transmission frequency and ensure it's compatible with your receiver or hub. Battery life and ease of battery replacement are also important factors.
Mounting Hardware: Verify that the contact comes with the necessary screws, adhesive, or mounting brackets for your specific installation environment.
Comparison Tips
For new installations or where aesthetics are paramount, recessed mount options offer a cleaner look.
If ease of installation and flexibility are priorities, wireless surface mount contacts are often the best choice.
Always check the manufacturer's specifications for the maximum operating gap and ensure it meets your needs.
For critical applications, wired contacts with tamper protection provide the highest level of security and reliability.
Frequently Asked Questions
What is the primary function of a commercial door contact?
A commercial door contact, typically a magnetic reed switch, monitors the status of a door (open or closed). It sends a signal to a security panel when the door is opened or closed, triggering alarms or logging access.
What is the difference between normally open (NO) and normally closed (NC) contacts?
Normally closed (NC) contacts are the most common for security systems; they are closed (conducting) when the door is shut and open when the door is opened. Normally open (NO) contacts are the opposite, open when the door is shut and closed when opened.
Can wireless door contacts be as reliable as wired ones?
Modern wireless door contacts offer high reliability with advanced encryption and robust transmission protocols. However, wired contacts are generally considered more immune to interference and power outages if backup power is not robust.
What does the gap distance specification mean?
The gap distance refers to the maximum separation between the two parts of the contact (magnet and sensor) before the circuit is broken or completed. It's crucial to choose a contact with a gap distance suitable for your door and frame.
How do I determine the correct type of contact for my business?
Consider your installation environment, existing security system, and desired aesthetic. Wired contacts are robust for new builds, while wireless offers flexibility for existing structures or complex layouts.
What is tamper protection on a door contact?
Tamper protection is a feature that detects if someone tries to remove or disable the contact device itself. If tampered with, it sends a separate alert to the security system, adding an extra layer of security.
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