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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🛡️ Elevate your security game with stealth and precision!

DUAL MODE FLEXIBILITY - Switch freely between Normally Open (NO) and Normally Closed (NC) configurations to suit your custom alarm setup.
DURABILITY YOU CAN TRUST - Engineered for over 1,000,000 cycles, ensuring long-lasting, reliable performance in your security setup.
COMPLETE INSTALLATION KIT - Includes 3 magnetic sensors, 12 screws, and 6 adhesive stickers for quick, hassle-free mounting.
SEAMLESS SECURITY INTEGRATION - Easily hidden recessed design blends with any door or window frame for discreet protection.
UNIVERSAL VOLTAGE COMPATIBILITY - Operates flawlessly across a wide DC voltage range (3V to 100V), perfect for diverse access control systems.

The Gebildet 3-set Black Magnetic Switch Wiring kit offers versatile, recessed magnetic door/window sensors with NO/NC switch modes, supporting up to 100V DC and 0.5A current. Compact and durable, these sensors come with screws and stickers for easy installation, ideal for modern access control and alarm systems.

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Battery description	Battery not included
Voltage	100 Volts
Mounting type	Wall Mount
Maximum range	15 Metres
Sensor technology	Contact Sensor
UPC	726972605882
Manufacturer	Gebildet
Part Number	DE453
Product Dimensions	2.9 x 1.5 x 0.9 cm; 50 g
Item model number	DE453
Horsepower	0.1 hp
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	50 g

Gebildet3 sets Black Magnetic Switch Wiring NO/NC Recessed Door Sensor Hidden Window Contact Reed Switch for Access Control Replace Alarm System

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