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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3 sets Black Magnetic Switch Wiring NO/NC Recessed Door Sensor Hidden Window Contact Reed Switch for Access Control Replace Alarm System

Product ID: 217666327

Details

Brand
Gebildet
Connector type
Crimp
Contact type
Normally
Current rating
0.5 Amps
Item dimensions L x W x H
14 x 11 x 1.1
Material
Plastic

🔄1,000,000+ lifespan cycles

🔋Supports 1-100V DC

🧲NO/NC dual magnetic switch

R523

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Elevate your security game with invisible precision!

PROVEN RELIABILITY - Engineered for over 1 million cycles to keep your access control flawless and worry-free.
COMPLETE INSTALLATION KIT - Includes screws and stickers for effortless, professional-grade mounting.
DURABLE DISCREET DESIGN - Compact 29x15x9mm black ABS casing blends invisibly into any door or window frame.
DUAL MODE MAGNETIC SWITCHING - Choose between normally open or normally closed for tailored security setups.
UNIVERSAL VOLTAGE COMPATIBILITY - Seamlessly integrates with 3V to 100V systems for ultimate flexibility.

The Gebildet 3-set Black Magnetic Switch Wiring kit offers versatile NO/NC recessed door and window sensors designed for professional access control and alarm systems. Supporting a wide voltage range (1-100V DC) and rated for 0.5A current with 10W max power, these compact ABS magnetic reed switches deliver over 1 million reliable cycles. The package includes all mounting essentials, making it ideal for seamless integration into wooden doors and windows to enhance security discreetly and effectively.

Specifications

ASIN	B085XQLQ3N
Best Sellers Rank	48,291 in DIY & Tools ( See Top 100 in DIY & Tools ) 480 in Switches & Dimmers
Brand	Gebildet
Circuit Type	2-way
Colour	Black
Compatible Devices	Security System
Connector Type	Crimp
Contact Material	Plastic
Contact Type	Normally Closed
Control Method	Sensor
Control Type	Magnetically Controlled
Country Of Origin	China
Current Rating	0.5 Amps
Customer Reviews	4.2 4.2 out of 5 stars (899)
Item Dimensions	14 x 11 x 1.1 centimetres
Item Weight	0.05 Kilograms
Manufacturer	Gebildet
Manufacturer Part Number	DE453
Material	Plastic
Model Number	DE453
Mounting Type	Wall Mount
Number of Items	1
Number of Positions	1
Operating Voltage	100 Volts
Operation Mode	NC-NO
Specification Met	CE
Switch Type	Magnetic Switch
Terminal	Crimp
UPC	726972605882
Wattage	10 watts

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