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 5pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Switch Black, Magnetic Door Sensor, Normally Closed Magnetic Switch

Gebildet 5pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Switch Black, Magnetic Door Sensor, Normally Closed Magnetic Switch

Product ID: 235404839

Details

Brand
Gebildet
Circuit Type
1-way
Connector Type
Screw
Contact Type
Normally
Current Rating
0.5 A
Material
Acrylonitrile

📏10-15mm sensing range

🔋1,000,000 cycles lifespan

🔌0.5A current, 100V voltage

€ 18.25

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Description

🔒 Stay a step ahead—secure smarter, not harder.

DURABILITY THAT LASTS - Engineered for 1,000,000+ cycles—security that keeps pace with your busy lifestyle.
PRECISION SENSING RANGE - Detects door/window status within a sharp 10-15mm gap for reliable alerts.
COMPACT DISCREET DESIGN - Sleek black ABS casing (29x15.5x9mm) blends effortlessly into any modern space.
COMPLETE INSTALLATION KIT - Includes 5 sensors, 20 screws, and 10 stickers—everything you need to secure your home instantly.
PLUG PLAY COMPATIBILITY - Seamlessly integrates with home automation and security hubs for smart control.

The Gebildet 5pcs Recessed Wired Security Window Gate Contact Sensor Set offers precision magnetic reed switches with a 10-15mm sensing distance, supporting up to 1 million operational cycles. Designed in sleek black ABS, each sensor operates at 0.5A and 100V max, ensuring reliable integration with home security and automation systems. The package includes all mounting hardware for quick, professional installation, making it a top choice for millennial professionals seeking discreet, durable, and smart home security solutions.

Specifications

ASIN	B07YFBG27Y
Best Sellers Rank	#7,929 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Reed Switches #18 in Garage Door Sensors
Brand Name	Gebildet
Circuit Type	1-way
Color	Black-NC
Compatible Devices	Security systems, home automation hubs, door lock systems
Connector Type	Screw
Contact Material	Plastic
Contact Type	Normally Closed
Control Method	Sensor
Control Type	ON-OFF
Current Rating	0.5 A
Customer Reviews	4.0 4.0 out of 5 stars (107)
Item Weight	0.07 kg
Manufacturer	Gebildet
Material Type	Acrylonitrile Butadiene Styrene
Model	E332
Mounting Type	Door Mount
Number of Items	5
Number of Positions	5
Operating Voltage	100 volts
Operation Mode	ON-NONE-OFF
Part Number	E332
Switch Type	Reed Switch
Terminal	Screw
UPC	781621382491
Unit Count	1 Count
Wattage	10 watts

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€ 18.25

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered 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 Italy.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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4 days ago

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