SpzcdZa 2Sets Magnetic Reed Switch Normally Open Closed NC NO Door Alarm Window Security/Magnetic Door Switch/Magnetic Contact Switch/Reed Switch for GPS,Alarm or Other Device,DC 5V 12V 24V Light

I used these to replace a power step switch in our RV. Half the price of RV specific and the ability to choose NC or NO was key. Works great and very sensitive to magnet doesn’t have to be right next to it.

The SpzcdZa 2Sets Magnetic Reed Switch is a game-changer when it comes to door and window security. These switches are designed to keep your home or office safe and sound, and they do it effortlessly.With a variety of voltage options (5V, 12V, and 24V), these magnetic reed switches are versatile and compatible with various devices, including GPS systems and alarms. What sets them apart is their dual functionality. They can be used as normally open (NO) or normally closed (NC) switches, depending on your needs.Imagine a scenario where you've installed these switches on your doors and windows. They seamlessly detect any unauthorized entry, triggering an alarm or alerting your security system. The peace of mind these switches offer is unparalleled.What's even more impressive is the reliability of the SpzcdZa Magnetic Reed Switch. They are built to last and withstand the test of time, ensuring your security remains top-notch. Plus, they're incredibly easy to install, making it a hassle-free experience.In a world where security is paramount, the SpzcdZa 2Sets Magnetic Reed Switch is a must-have. It's not just a product; it's your guardian, providing security and peace of mind that you can rely on day in and day out. Don't compromise on safety; choose SpzcdZa for a safer tomorrow.

Worked great

I have several sets on 50-100' wire lengths back to an MCP23017 I/O expander chip at 3.3V, set to generate an IRQ on edge events. As with most switches, they were quite "bouncy" at first, but a 1uF cap across each (at the controller end) solved thatContact resistance was generally 3-6 ohm, which was fine, but one side of one of the switches (I can't remember if it was NO or NC side) was up over 600-800 ohms at first, varying slightly on every cycle, but never as bad as the one in Nancy's review. However, this "fixed" itself after I accidentally dropped it about 5' on to a concrete floor, and has operated reliably ever since! I used large enough pull-up resistors (22k?) on these sense lines to hopefully tolerate that level of contact resistance if it returns, but after 4 months, it's still under 10 ohms.The double-throw design of reed relays inside these could make intermittent marginal contact more likely. I'd have chosen NC-only (closed when magnet is present) if those were available for the same price.You really don't want to run any significant current or voltage across these. It may work at first, but contacts are unlikely to last very long in this role. Use a FET, etc. if needing to directly switch a load.

Easy to install, works great