Product Description
The 52mm Glass Reed Switch is a passive electrical switch operated by an applied magnetic field. It consists of a pair of flexible, ferromagnetic metal reeds hermetically sealed in a glass envelope. When a permanent magnet or an electromagnet is brought near the switch, the magnetic flux causes the reeds to attract each other and touch, completing the electrical circuit. This non-contact sensing method is highly reliable, as the sealed environment protects the contacts from dust, moisture, and corrosion. It is widely used for door/window sensors in security systems, liquid level sensing with a float magnet, and speed sensing in bicycle computers.
Key Highlights
Contactless Operation: Since the switch is triggered by magnetic fields, there is no physical wear and tear on the trigger mechanism, ensuring millions of cycles.
Hermetically Sealed: The glass enclosure prevents oxidation of the contacts, making it ideal for use in hazardous, damp, or dusty environments.
Zero Standby Power: As a passive component, it consumes no electricity until the circuit is closed, making it perfect for battery-powered IoT devices.
Versatile Mounting: The long 52mm leads can be easily bent, trimmed, or soldered onto PCBs and custom sensor housings.
Fast Response: Capable of high-speed switching, suitable for proximity counting and rpm sensing in industrial machinery.
Technical Specifications
Contact Form: Form A (Normally Open)
Max Switching Power: 10W
Insulation Resistance: $10^{9}\ \Omega$
Operating Temperature: -40°C to +125°C
Breakdown Voltage: 200V DC
Glass Diameter: ~2mm
Installation Tip from Robogears
Glass reed switches are extremely fragile. When bending the leads for PCB mounting, always use a pair of long-nose pliers to hold the lead near the glass seal; never put stress directly on the glass-to-metal interface, or it will crack and fail. To interface this with an Arduino, connect one end to a Digital Pin and the other to Ground, then enable the internal INPUT_PULLUP. When a magnet is present, the pin will read LOW.
Note: This product is the glass reed switch ONLY. Magnets and mounting clips are sold separately. Product images are for illustration purposes only.
