Sensor Switch | Normally Open/Closed (NO/NC) | 10mm to 38mm GPS-01

This item is a magnetic sensor, also called a magnetic reed switch. It's a normally open (NO) switch. This means the circuit stays open until a magnet comes close. Its small, round shape helps it fit ...
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Questions about this product
- What's the difference between the 'Normally Open' and 'Normally Closed' versions?
- A Normally Open (NO) switch creates a closed circuit only when a magnet is brought near it. A Normally Closed (NC) switch has a closed circuit by default, which then opens and breaks the connection when a magnet approaches.
- What do the different millimetre sizes like 10mm and 15mm refer to?
- The size in millimetres refers to the length of the glass body of the reed switch itself, not the overall length with wires. You'd pick the size based on the physical space you have available for mounting it in your project.
- Can I use these directly with mains voltage to switch a light?
- No, these are low-voltage, low-current switches designed for signal-level applications like security alarms or microcontroller inputs. You should not connect them directly to mains voltage; use them to trigger a relay or a similar device that is rated for mains power.
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