$9.99 $1.00 per Count
Get Fast, Free Shipping with Amazon Prime FREE Returns
FREE delivery Saturday, March 15 on orders shipped by Amazon over $35
Or Prime members get FREE delivery Thursday, March 13. Order within 6 hrs 24 mins.
In Stock
$$9.99 () Includes selected options. Includes initial monthly payment and selected options. Details
Price
Subtotal
$$9.99
Subtotal
Initial payment breakdown
Shipping cost, delivery date, and order total (including tax) shown at checkout.
Ships from
Amazon
Amazon
Ships from
Amazon
Sold by
BNYZWOT
BNYZWOT
Sold by
BNYZWOT
Returns
30-day refund/replacement
30-day refund/replacement
This item can be returned in its original condition for a full refund or replacement within 30 days of receipt.
Read full return policy
Payment
Secure transaction
Your transaction is secure
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more

MC-38 Surface Mount Wired NC Door Sensor Alarm Magnetic Reed Switch White 10 Pair

4.2 4.2 out of 5 stars 134 ratings
$9.99 with 23 percent savings $1.00 per Count
List Price: $12.99
Get Fast, Free Shipping with Amazon Prime
FREE Returns
Coupon:  
{"desktop_buybox_group_1":[{"displayPrice":"$9.99","priceAmount":9.99,"currencySymbol":"$","integerValue":"9","decimalSeparator":".","fractionalValue":"99","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"XVXduQSadSDf9hFINNttZyF3jSc2pMr%2Bb5sHfUJf1fqIwSsbpU%2BeP8OouiVAKAKfN2EoEQVyJpZFRdzyPDhLdLHBDgJjLmki01mboV9ByRARSAvw%2F93Kgb30rxTzsrayefi4lbNJ4cG%2B1I3K4cQBL28oirLCF4LUXqufGA6zIATF%2B0ZOfXxPHeBJ%2BtsiMBJ1","locale":"en-US","buyingOptionType":"NEW","aapiBuyingOptionIndex":0}]}

Purchase options and add-ons

Operation Mode NC
Current Rating 0.5 Amps
Operating Voltage 100 Volts
Contact Type Normally Closed
Connector Type Screws
Brand BNYZWOT
Circuit Type single-pole single-throw, normally closed
Mounting Type Door,Surface
Actuator Type Hinge Lever
Contact Material Plastic
Switch Type
Normally Closed
Material
Acrylonitrile Butadiene Styrene

About this item

  • Product Name: Magnetic Door Switch ;Model: MC-38;Package Content: 20 x Magnetic Door Switch, Some Install Parts;Normally closed: the magnet is close to conducting, and the magnet is open when leaving
  • Contact Type: NC (Normally Closed) ;Actuation Distance: 18mm ± 6mm;
  • Max. Current: 0.5A ;Max. Power: 10W; Working Voltage: DC0-100V
  • Each Size(Approx): 27 x 14 x 7.8mm / 1.06-inch x 0.55-inch x 0.31-inch (L*W*H) ;Mounting Hole Diameter: 4mm/0.16-inch
  • Cable Length(Each): 26cm / 10.24-inch Material: ABS (Housing) Wire Type: 1007UL#24AWG Color: White Net Weight: 120g
› See more product details

Frequently bought together

BNYZWOT MC-38 Surface Mount Wired NC Door Sensor Alarm Magnetic Reed Switch White 10 Pair
This item: BNYZWOT MC-38 Surface Mount Wired NC Door Sensor Alarm Magnetic Reed Switch White 10 Pair
$9.99 ($1.00/Count)
Get it as soon as Saturday, Mar 15
In Stock
Sold by BNYZWOT and ships from Amazon Fulfillment.
+
Shelly Plus 1 UL | WiFi & Bluetooth Smart Relay Switch with Dry Contacts | Home Automation | Alexa, SmartThings & Google Home
$77.49 ($19.37/Count)
Get it as soon as Saturday, Mar 15
In Stock
Sold by Shelly USA and ships from Amazon Fulfillment.
+
Shelly 1 Mini Gen3 | WiFi & Bluetooth Smart Switch Relay 1 Channel 8A | Home Automation | Compatible with Alexa & Google Home
$14.99
Get it as soon as Saturday, Mar 15
In Stock
Sold by Shelly USA and ships from Amazon Fulfillment.
Total price: $00
To see our price, add these items to your cart.
Details
Added to Cart
spCSRF_Treatment
These items are shipped from and sold by different sellers.
Show details Hide details
Choose items to buy together.

Product details

  • Package Dimensions ‏ : ‎ 4.2 x 4 x 1 inches; 0.01 ounces
  • Item model number ‏ : ‎ A35
  • Date First Available ‏ : ‎ July 27, 2019
  • Manufacturer ‏ : ‎ BNYZWOT
  • ASIN ‏ : ‎ B07VMYG7GF
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.2 4.2 out of 5 stars 134 ratings

Product Description


1.Self-Adhesive Mount, Screw Surface Mount contact, ABS Housing. Long wire lead that can side mounted.
2.Switch Type: NC means Normally Closed:When the magnet together, the circuit is conductive( light on ); when the magnet separate, the circuit is not conductive ( light off ).
3.Work as an anti-theft alarm, ideal for wood door and window.

Nc: when the magnet is near, the circuit is on;
When the magnet moves away and the circuit is Off.
No: When the magnet is near, the circuit is off,
When the magnet moves away and the circuit is ON.

Looking for specific info?

Customer reviews

4.2 out of 5 stars
134 global ratings

Review this product

Share your thoughts with other customers
Write a customer review

Customers say

Customers find the electronic switch offers good value for money. However, some customers have reported issues with quality and durability, mentioning high failure rates, poor on-resistance after 4 months, and deteriorating on-residual resistance. Opinions differ on its functionality.

AI-generated from the text of customer reviews

Select to learn more

Value for moneyFunctionalityQuality
4 customers mention "Value for money"4 positive0 negative

Customers like the value for money. They say the product is a good price but seems of marginal quality.

"I purchased this set because it was a great price and I didn't feel like paying $20 for just one magnet sensor for my Nexx wifi garage opener...." Read more

"These were a good price but appear of be of marginal quality. One of the ten switches does not work, no matter what magnet is used with it...." Read more

"...Price was very good too." Read more

"Great for the price..." Read more

9 customers mention "Functionality"4 positive5 negative

Customers have mixed reviews about the electronic switch's functionality. Some say it works great and is cheaper than Nexx, while others report issues like one of ten switches not working, failing within a short period of time, or no longer functioning after 4 months.

"...I have found is some of the tape was uncovered in shipping and does not work. But I am screwing them in so it does not matter to me" Read more

"...Then I finished the job up with some heat shrink wrap. Works like a cramp now!..." Read more

"Used these on a gate. After 4 months they go bad and no longer switch. Luckily 10 come in a package so replacement was quick. But it failed again...." Read more

"Works great for low-voltage alarms are controls" Read more

5 customers mention "Quality"1 positive4 negative

Customers are dissatisfied with the quality of the electronic switches. They report a high failure rate, poor on-resistance after 4 months, and deteriorating switch resistance from less than 1 ohm to more than 1 ohmic after 4 months.

"Used these on a gate. After 4 months they go bad and no longer switch. Luckily 10 come in a package so replacement was quick. But it failed again...." Read more

"These were a good price but appear of be of marginal quality. One of the ten switches does not work, no matter what magnet is used with it...." Read more

"...My investigation found that the switch On-Resistance has deteriorated from less than 1 Ohm when newly installed to greater than 45 Ohms within 6..." Read more

"Good product, works as it should. Will work with DSC alarm systems and most systems that recognize a closed contact when touching the magnetic part...." Read more

Top reviews from the United States

  • Jonathan Dautrich
    5.0 out of 5 stars Switches themselves are NO, not NC
    Reviewed in the United States on February 1, 2025
    Verified Purchase
    Heads up these switches themselves are actually NO (normally open) switches, not NC (normally closed). I believe the reason they're labeled NC is that during normal operation (door closed), the magnet is right next to the sensor, in which case the switch is closed.
    Helpful
     Report
  • Tim
    5.0 out of 5 stars Great for the price
    Reviewed in the United States on March 6, 2020
    Verified Purchase
    The only problem that I have found is some of the tape was uncovered in shipping and does not work. But I am screwing them in so it does not matter to me
    Helpful
     Report
  • Steve Rowe
    4.0 out of 5 stars Worked, but wires were very fine
    Reviewed in the United States on November 4, 2021
    Verified Purchase
    Weird were so small they were hard to strip. Otherwise great and do the job
    Helpful
     Report
  • Timothy Babb
    5.0 out of 5 stars worked great and was much cheaper then Nexx
    Reviewed in the United States on October 24, 2019
    Verified Purchase
    I purchased this set because it was a great price and I didn't feel like paying $20 for just one magnet sensor for my Nexx wifi garage opener. I got this item in today. I quickly cut the old wire that went to the nexx sensor. Twisted the wires together, added a little solder. Then I finished the job up with some heat shrink wrap. Works like a cramp now! I didn't need all 10 sensors but I figured if the original nexx sensor went out. Then over time this one would probably give out too, so with an extra 9 on hand. I no longer have to worry about it.
    One person found this helpful
    Helpful
     Report
  • CaveatEmptor
    1.0 out of 5 stars High failure rate
    Reviewed in the United States on February 6, 2024
    Verified Purchase
    Used these on a gate. After 4 months they go bad and no longer switch. Luckily 10 come in a package so replacement was quick. But it failed again. Look elsewhere for something that is more reliable.
    Helpful
     Report
  • Joseph McCall
    5.0 out of 5 stars Ten for the price of one
    Reviewed in the United States on December 11, 2023
    Verified Purchase
    Needed a reed switch for my garage door automation (goodbye MyQ!) and this pack was the same price as one switch from my local shop. They're simple switches, so wasn't expecting any problems, and I was not disappointed. Now I just need to find nine other projects..
    Helpful
     Report
  • Douglas Busby
    3.0 out of 5 stars These are not normally closed (N/C) switches
    Reviewed in the United States on September 11, 2021
    Verified Purchase
    They normally closed magnetic switch allows electricity to flow when it's not near a magnet. This is useful for things such as door and window alarms that run on battery power. The transmitter is powered off when the magnet is near the switch, and powers on when the magnetic contact is broken, so it can then send the signal that the door is open. This allows it to conserve battery power.

    These switches allow current flow when the switch is near the magnet. For a door or window switch this means your circuit board is drawing current the whole time the door window is closed. That also means your batteries will last about 2 days at the most.

    These are actually normally open (N/O) switches. When magnetic contact is broken they allow current to flow so you can control lights with a door being opened.

    They function for what they really are, so I am giving them three stars. I'm removing two stars from a five-star review because now I have to take the time to ship them back.
    8 people found this helpful
    Helpful
     Report
  • D. Eskew
    5.0 out of 5 stars Works good
    Reviewed in the United States on June 13, 2023
    Verified Purchase
    Works great for low-voltage alarms are controls
    Helpful
     Report