Are you certain these switches are normally closed ? The picture of the light circuit indicates they are normally open, without magnet.

You are correct. Almost all of the reed switches on Amazon universally have the NO/NC descriptions backwards. Even the guy who responded to you about his RV steps was mistaken as his application would require a normally closed switch (ie. door opening and removing the magnet would allow the current to flow). I think the big misunderstanding is these vendors (and some people) think the "normal" position is with a magnet adjacent the reed switch. It is not.

Can this be used in a 12v application? I wanted to use ground to trigger a negative input(car alarm application)

Yes, I am also using it for 12V lights. You limit is going to be the 0.5amp load.

Are these waterproof or at least water resistant?

Yes . It is water proof . Just only wires connection for sensor ( over 10'' long) must be in dry area.

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Gebildet 3pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Switch Black,Magnetic Door Sensor, Normally Open Magnetic Switch

Product ID: 418705592

Details

Brand
Gebildet
Connector Type
Wire Leads
Current Rating
0.5 Amps
Operation Mode
NO/NC
Switch Type
No/Nc

📏10-15mm sensing distance

🔋1,000,000+ service life cycles

🔌0.5A current, 100V voltage

¥6894

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔒 Elevate your security game with precision and durability you can trust!

DURABILITY THAT LASTS - Engineered for over 1 million cycles, ensuring long-term peace of mind without frequent replacements.
SLEEK RECESSED DESIGN - Discreet black ABS casing fits flush with doors or windows, maintaining your modern aesthetic.
PRECISION SENSING RANGE - Detects door/window status within a 10-15mm gap for reliable security triggers.
COMPLETE INSTALLATION KIT - Includes screws and adhesive stickers for effortless, professional-grade setup—no extra trips to the hardware store.
PLUG PLAY WIRED CONNECTIVITY - 33cm wire length with screw terminals for seamless integration into existing security systems.

The Gebildet 3pcs Recessed Wired Security Window Gate Contact Sensor Alarm features a compact 29x15.5x9mm black ABS design with a 10-15mm sensing distance. It supports a working current of 0.5A and voltage up to 100V, delivering reliable magnetic reed switch performance with a lifespan exceeding 1 million cycles. The package includes three sensors, screws, and adhesive stickers for easy installation, making it an ideal upgrade for professional-grade home or office security systems.

Specifications

Asin	B085XQLQ3N
Best Sellers Rank	#339,021 in Home Improvement (See Top 100 in Home Improvement) #12,389 in Home Security Systems
Brand Name	Gebildet
Colour	Black
Compatible Devices	Security System
Connector Type	Wire Leads
Contact Type	Normally Open
Control Method	Remote
Current Rating	0.5 Amps
Customer Reviews	4.2 4.2 out of 5 stars (865) 4.2 out of 5 stars
Item Dimensions	14 x 11 x 1.1 Centimeters
Item Weight	0.05 Kilograms
Manufacturer	Gebildet
Material Type	wood
Model Number	DE453
Mounting Type	Wall Mount
Number Of Items	1
Number Of Positions	1
Operating Voltage	100 Volts (AC)
Operation Mode	NO/NC
Part Number	DE453
Switch Type	No/Nc
Terminal	Screw
Upc	726972605882
Wattage	10 Watts

Reviews

User

Correct

Fais le job

22.12.2025

User

Bon commutateur magnétique NO/NC

Très bon article , ce commutateur magnétique offre beaucoup de possibilités car il est NO/NC. Il est d'une taille passe -partout , ni trop grande , ni trop petite , tout en étant compact

26.08.2026

User

Proffesionell Qualität.

Sehr schnell geliefert , Öffner Schließer Kontakte..mit Schrauben und Klebe Befestigung inklusive. 0.5 Ampere und mit max 100 volt belastbar.Reed Kontakt mit passenden Magneten..Drei Stück im Set.

5.07.2026

User

Liten och snygg

En av magnetströmbrytarna fungerade inte!

19.05.2024

User

Funzionale

Buon Reed da usare come anche come finecorsa per automazioni

26.07.2026

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¥6894

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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