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magnetic contact switch
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Home Accessories Magnetic Contact Switch – Wired
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Magnetic Contact Switch – Wired

$9.20

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Magnetic Contact Switch

A magnetic contact switch, often simply called a magnetic contact or door/window sensor, is a simple yet highly effective security device that detects when a door, window, gate, or any movable barrier is opened or closed.

How it Works:

It consists of two main parts:

  1. The Sensor Unit (with a Reed Switch): This part contains a reed switch. A reed switch is a small, hermetically sealed (airtight) glass capsule with two tiny, flexible magnetic metal reeds (or contacts) inside. These reeds are usually made of a ferromagnetic material. This sensor unit is typically mounted on the stationary part of the opening (e.g., the door frame, window frame, or gate post).
  2. The Magnet Unit: This part contains a small, permanent magnet. This unit is mounted on the moving part of the opening (e.g., the door itself, the window sash, or the gate panel).

The Operational Principle:

  • Closed Position (Circuit Complete): When the door/window/gate is closed, the magnet unit is in very close proximity to the sensor unit. The magnetic field from the permanent magnet pulls the two tiny reeds inside the glass capsule together, causing them to make electrical contact. This completes an electrical circuit, indicating that the opening is secured.
    • Many common contacts are “Normally Open” (NO), meaning the circuit is open when the magnet is away and closes when the magnet is near.
    • Some are “Normally Closed” (NC), meaning the circuit is closed when the magnet is near and opens when the magnet is away. This is very common in security systems, as an “open” circuit triggers an alarm.
  • Opened Position (Circuit Broken/Changed): When the door/window/gate is opened, the magnet moves away from the reed switch. As the magnetic field weakens, the reeds spring back to their original position, breaking the electrical contact. This change in the circuit (from closed to open, or open to closed, depending on the type) signals the connected system (e.g., a car alarm, home security system, or gate control panel) that the opening has occurred.

Common Applications:

  • Security Systems (Homes, Businesses, Vehicles): This is the most prevalent use. Magnetic contacts are placed on:
    • Doors and Windows: To detect unauthorized entry. When a door or window is opened, it triggers the alarm.
    • Garage Doors/Overhead Doors: Larger, more robust magnetic contacts are used for garage doors.
    • Gates: Used on pedestrian gates or even main driveway gates (sometimes in conjunction with the gate opener’s own limit switches) to monitor their open/closed status for security purposes.
    • Safes and Vaults: To detect if they have been opened.
    • Vehicle Doors/Trunks/Hoods: While vehicles have internal sensors, magnetic contacts can be added for enhanced security on specific compartments or custom modifications.
  • Access Control Systems: To monitor entry and exit points, log access events, or control other devices based on door status.
  • Automation Systems: To trigger actions based on the status of a movable part. Examples include:
    • Turning lights on/off when a door opens.
    • Indicating when a cabinet door is ajar.
    • Position sensing in industrial machinery.
  • Appliance Safety: Some appliances use magnetic contacts to ensure a lid is closed or a guard is in place before operation.

Types:

  • Surface Mount: Most common, easily screwed or adhered to the surface of the frame and door.
  • Recessed/Flush Mount: Designed to be drilled into the frame and door for a more discreet, hidden installation.
  • Heavy Duty/Overhead Door Contacts: Larger and more rugged, built for the heavier use and larger gaps often found with garage or industrial doors.
  • Wired vs. Wireless:
    • Wired: Physically connected to the alarm panel via wires, offering high reliability.
    • Wireless: Contain a small battery and a radio transmitter to send signals wirelessly to the alarm panel, offering easier installation.

In Vancouver, BC, magnetic contact switches are a common product found at security system suppliers, electrical wholesalers, and businesses that install residential and commercial security systems, including companies like Royal Gates if they offer security integrations for their gate systems.

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Category: Accessories Tags: gate automation, gate motor, Gate opener, gate operator, magnet
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Description

Magnetic Contact Switch

*NC/NO

*0.5 A

A wired magnetic contact switch, also known as a door or window sensor, is a security device that uses a magnetic field to detect when a door or window is opened or closed. It consists of two main parts: a wired component with a reed switch and a magnet. When the door or window is closed, the magnet is close to the reed switch, completing a circuit. When the door or window is opened, the magnet moves away, breaking the circuit and triggering an alarm or other action. 

How it works:
  • Reed Switch: The wired magnetic contact switch component contains a reed switch, which is a small, sealed glass capsule with two magnetic metal reeds inside. 
  • Magnet: The magnet is placed on the moving part of the door or window. 
  • Closed Circuit: When the magnet is close to the reed switch (door/window closed), the magnetic field pulls the reeds together, creating a closed circuit. 
  • Open Circuit: When the door/window is opened, the magnet moves away, the magnetic field weakens, and the reeds separate, opening the circuit. 
  • Alarm Trigger: The open circuit signals the alarm system, triggering an alert. 
Types of Magnetic Contact Switches:
  • Surface Mount:

    Wired magnetic contact switchs are the most common and are easily attached to the door or window frame.

  • Recessed/Flush Mount:
    These are installed inside the door or window frame, providing a more discreet look.
  • Overhead Door Contacts:
    Larger and more robust, designed for garage doors and overhead rolling doors.
  • High Security/Balanced Magnetic Contacts:
    Used for higher security applications where tampering is a concern. 
Common Applications:
  • Security Systems: Wired magnetic contact switch detecting intrusion through doors and windows.
  • Access Control: Wired magnetic contact switch monitoring entry and exit points.
  • Automation Systems: Triggering actions based on door/window status.
  • Industrial Applications: Wired magnetic contact switch monitoring doors and gates in industrial settings. 
Additional information
Weight 0.02 kg
Dimensions 5 × 5 × 1 cm
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We are proud to provide you with driveway gate operator services and accessories. We have more than 28 years of experience in selling, installing, maintaining, and repairing electronic accessories for homes with the latest technology.
• #100 - 11538 132a St, Surrey, BC, V3R 7S2
• Sales Dep.: (778)384-2800
• Service Dep.: (778)561-4530
• info@retcc.ca

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