Magnetic Contact Switch Sensor Products

Description

Magnetic contact switches are often used to detect if a door or window is open/closed. It consists of a magnet and reed switch in separate enclosures (ABSAcrylonitrile Butadiene Styrene thermoplastic polymer plastic or metal), where the switch turns on/off when the magnet is near the reed switch. Magnetic contact switches come in three different configurations: Normally Closed (NC), Normally Open (NO), and both Normally Closed or Open (NC/NO). These configuration are defined below.

Normally Closed (NC):

An NC magnetic contact switch is normally closed without the magnet and conducts electricity (i.e., the door opening and removing the magnet would close the switch and allow the current to flow) and the switch opens when the magnet is near it, not allowing current to flow.

Normally Open (NO):

An NO magnetic contact switch is normally open without the magnet and cannot conduct electricity (i.e., the door opening and removing the magnet would open the switch, not allowing current to flow) and the switch closes when the magnet is near it to allow current to flow.

Normally Closed or Open (NC/NO):

These magnetic contact switches have both NC and NO options with three terminals: NC, NO, and COMCommon Ground where COM is the common ground.

There is a common misunderstanding among vendors selling these switches that think the "normal" position is with a magnet next to the reed switch, probably because its in the normal position when on a door/window, so sometimes you see the NC or NO in the title of the product is often backwards. In the product listings below, NC and NO have been corrected to be consistent with the definitions given above, but you may see them reversed on the product page. Before purchasing, it is recommended that you check for any clarification in the product description, product reviews, or Q&A comments.

Magnetic Contact Switches

Normally Closed (NC)

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Gebildet Wired Contact Sensor Alarm Magnetic Reed Switch Normally Closed (NC) Black (5PCS)

Seller: Gebildet

Package includes:

• 5x Reed Switches
• 5x Magnets
• 10x Adhesive Stickers
• 20x Screws

+ About this item:

• Sensing distance: 10mm to 15mm
• Working current: 0.5A
• Working voltage: 100V (1V to 100V)
• Maximum power: 10W
• This is a Normally Closed (NC) switch. When the magnet is removed, the switch is closed and conductive. When the magnet is near the switch, the switch is open and nonconductive.
• Wire length: 33cm
• Product size: 29x15.5x9mm

Price: $9.99(Updated 09Oct2024 20:45:242024-10-09T20:45:24Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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Normally Open (NO)

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JING MC-38 NO Magnetic Contact Switch Sensor (3PCS)

Package includes:

• 3x Reed Switches
• 3x Magnets
• 12x Screws

+ About this item:

• Sensing distance: 15mm-25mm
• Product size: 64 x 19 x 13mm/2.52 x 0.75 x 0.51 inch.(L*W*H)
  Hole Diameter: 4mm/0.16 inch
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W
• Product title and description on Amazon is wrong. This is a Normally Open (NO) switch. When the magnet is removed, the switch is open and nonconductive. When the magnet is near the switch, the switch is closed and conductive.

Price: $7.99(Updated 09Oct2024 20:45:582024-10-09T20:45:58Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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uxcell MC-51 Wired NO Magnetic Reed Switch White (5PCS)

Seller: uxcell

Package includes:

• 3x Reed Switches
• 3x Magnets
• 12x Screws

+ About this item:

• Sensing distance: 16mm
• Product size: 50 x 14 x 12.2mm / 1.97 x 0.55 x 0.48-inch (L*W*H)
• Max current: 0.3A,
  Max voltage: 200V
  Maximum power: 3W
• Product title and description on Amazon is wrong. This is a Normally Open (NO) switch. When the magnet is removed, the switch is open and nonconductive. When the magnet is near the switch, the switch is closed and conductive.

Price: Unavailable (Updated 09Oct2024 20:46:112024-10-09T20:46:11Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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Augiimor 3Sets MC-32 Wired NO Magnetic Reed Switch White

Package includes:

• 3x Reed Switches
• 3x Magnets
• 12x Screws

+ About this item:

• Sensing distance: 15mm - 25mm
• Product size: 64 x 13x 13mm/2.52 x 0.51 x 0.51 inch (lL*W*H)
  Cable Length: 260mm / 10.24 inch
  Hole Diameter: 4mm/0.16 inch
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W

Price: $5.99(Updated 09Oct2024 20:46:282024-10-09T20:46:28Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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Normally Closed or Normally Open (NC/NO)

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TAKHRWOD M38 Wired NC/NO Magnetic Reed Switch White (2PCS)

Seller: TAKHRWOD

Package includes:

• 2x Reed Switches
• 2x Magnets
• 8x Screws

+ About this item:

• Sensing distance: 10mm - 20mm
• Switch size: 1.06"x0.55"x0.3"
  Magnet size: 1.06"x0.55"x0.3"(L*W*H)
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W

Price: $10.99(Updated 09Oct2024 20:47:322024-10-09T20:47:32Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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TAKHRWOD 31B NC/NO Magnetic Reed Switch White (2PCS)

Seller: TAKHRWOD

Package includes:

• 2x Reed Switches
• 2x Magnets
• 8x Screws

+ About this item:

• Sensing distance: 15mm – 25mm
• Switch size: 55*12.5*11.5mm / 2.17" x 0.45" x 0.45"(L*W*H)
  Mounting Hole Size: 7 x 2.5mm/ 0.28" x 0.1"(L*W)
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W

Price: $9.99(Updated 09Oct2024 20:47:392024-10-09T20:47:39Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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TAKHRWOD 31B NC/NO Magnetic Reed Switch Black (2PCS)

Seller: TAKHRWOD

Package includes:

• 2x Reed Switches
• 2x Magnets
• 8x Screws

+ About this item:

• Sensing distance: 15mm – 25mm
• Switch size: 55*12.5*11.5mm / 2.17" x 0.45" x 0.45"(L*W*H)
  Mounting Hole Size: 7 x 2.5mm/ 0.28" x 0.1"(L*W)
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W

Price: $9.99(Updated 09Oct2024 20:47:452024-10-09T20:47:45Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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tatoko 31B NC/NO Magnetic Reed Switch White (6PCS)

Seller: tatoko

Package includes:

• 6x Reed Switches
• 6x Magnets
• 15x Screws

+ About this item:

• Transmitting Distance: 15mm-25mm
• Size: 55 x 12 x 11mm / 2.2" x 0.47" x 0.43"(L*W*H)
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W

Price: $15.99(Updated 09Oct2024 20:47:502024-10-09T20:47:50Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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SpzcdZa NC/NO Magnetic Reed Switch White (2PCS)

Package includes:

• 2x Reed Switches
• 2x Magnets
• 1x Package of screws

+ About this item:

• Transmitting Distance: 15mm-25mm
• Size: 55*12.5*11.5mm / 2.17" x 0.45" x 0.45"(L*W*H)
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W

Price: $7.99(Updated 09Oct2024 20:48:072024-10-09T20:48:07Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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SpzcdZa NC/NO Magnetic Reed Switch Black (2PCS)

Package includes:

• 2x Reed Switches
• 2x Magnets
• 1x Package of screws

+ About this item:

• Transmitting Distance: 15mm-25mm
• Size: 55*12.5*11.5mm / 2.17" x 0.45" x 0.45"(L*W*H)
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W

Price: $9.99(Updated 09Oct2024 20:48:132024-10-09T20:48:13Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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uxcell Wired NC/NO Magnetic Reed Switch Black (3PCS)

Seller: uxcell

Package includes:

• 3x Reed Switches
• 3x Magnets

+ About this item:

• Max Sensing Distance: 10mm
• Size: 29x15.35mm/ 11.42" x 6.04" (L*W)
  Cable Length: 30cm/ 11.8"
  Hole Size: 8x4mm
  Installation Hole Distance: 15mm
• Max current: 0.5A,
  Max voltage: 100V
  Maximum power: 10W

Price: $17.99(Updated 09Oct2024 20:48:202024-10-09T20:48:20Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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Gebildet Wired Contact Sensor Alarm Magnetic Reed Switch NC/NO Black (3PCS)

Seller: Gebildet

Package includes:

• 3x Reed Switches
• 6x Adhesive Stickers
• 12x Screws

+ About this item:

• Sensing distance: 10mm to 15mm
• Working current: 0.5A
• Working voltage: 100V (1V to 100V)
• Maximum power: 10W
• Wire Colors: Blue for common; Black for NC; White for NO.
• Wire length: 30cm
• Product size: 29x15.5x9mm

Price: $9.99(Updated 09Oct2024 20:48:272024-10-09T20:48:27Z UTC UTC)

Amazon.com (Affiliate Link ⓘAs an Amazon associate I earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

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