Reed Switch | Normally Open Wired Contact | for DIY Alarm Systems

This wired door and window sensor uses a magnetic reed switch to secure entry points. It connects directly to your home alarm system panel for a steady, dependable connection. This is a Normally Close...
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Questions about this product
- Where's the best place to fit these sensors on a door or window?
- You'll want to mount the main switch part on the stationary frame and the magnet on the moving part of the door or window. Make sure they are aligned and as close as possible when shut. This ensures the magnetic field works correctly to close the circuit.
- How does this magnetic switch actually work with an alarm system?
- It's a simple reed switch. One part is a magnet and the other contains the switch; when they're together, the circuit is closed. When the door or window opens, the magnet moves away, the circuit opens, and this signals your alarm panel.
- Can I use these MC-38 sensors with any wired alarm system?
- Yes, these are standard normally closed (NC) reed switches, which are compatible with the vast majority of hardwired alarm panels. They work by creating a simple open/closed circuit, so as long as your system accepts a standard wired input, they should work fine.
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