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

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

Connector Type
Wire Leads
Contact Type
Normally Open
Current Rating
0.5 Amps
Operating Voltage
100 Volts (AC)
Operation Mode
NO/NC

📏10-15mm sensing distance

🔋1,000,000 cycles lifespan

🔌0.5A current, 100V voltage

€ 39.37

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔒 Lock in peace of mind with precision and durability!

SEAMLESS INTEGRATION - Wired design with 33cm leads fits effortlessly into existing security systems.
SLEEK DISCREET DESIGN - Compact black ABS casing (29x15.5x9mm) blends invisibly with modern interiors.
ENDURANCE YOU CAN TRUST - Engineered for 1,000,000+ activations, ensuring long-lasting, reliable protection.
PRECISION SENSING RANGE - Detects door/window status within a sharp 10-15mm gap for foolproof security.
VERSATILE COMPATIBILITY - Normally open magnetic reed switch works flawlessly with most home security setups.

The Gebildet 3pcs Recessed Wired Security Window Gate Contact Sensor Alarm features a compact, black ABS design with a 10-15mm sensing distance and a robust 1,000,000-cycle lifespan. Operating at 0.5A and up to 100V, these normally open magnetic reed switches provide reliable, wired security sensor integration for windows and doors, ideal for professional-grade home security systems.

Specifications

ASIN	B085XQLQ3N
Best Sellers Rank	#78,981 in Home Improvement ( See Top 100 in Home Improvement ) #3,147 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 (874)
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

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