What is the AT rating of these switches?

The AT rating is the Amp Turn rating of gauss to activate the switch. Since the vendor does not know this simple term best to stay away from this switch.

How close do you have to be to set it off?

While using a rather strong NeodymiumBoron magnet, I was somewhat disappointed to find I had to be within an inch or 2.5 cm to get it to close.

what are the dimensions of the glass tube? Diameter, approx length?

I'm pretty sure this is what I have; glass part is .5 inches. I didn't use them; I found if you put pressure on the tails, they crack.

Is this latching, or only magnet presence?

These are NOT latching... only close in presence of magnetic field...and does not require much to close. I use these routinely under 1-2 inches of plastic and can still get them to actuate with a very small 1/4" neodymium magnet.

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10Pcs Reed Switch Normally Open (N/O) Magnetic Induction Switch Electromagnetic for Arduino (Pack of 10) CYT1004

Product ID: 41308582

Details

Brand
Cylewet
Circuit Type
1-way
Connector Type
Screw
Contact Type
Normally Open
Current Rating
0.55 A
Material
Glass

⚡300V max switching voltage

📏Compact 45mm length

🔋0.55A max switching current

3.76 OMR

Duties & taxes included

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Description

🧲 Magnetically precise switches for the DIY innovator’s toolkit!

DURABLE GLASS ENCAPSULATION - Protects sensitive contacts while maintaining IP54-level dust and splash resistance for longevity.
COMPACT LIGHTWEIGHT DESIGN - Slim 14mm glass tube and 2mm diameter fit seamlessly into tight spaces without adding bulk.
PRECISION MAGNETIC ACTIVATION - Normally open reed switch triggers reliably with subtle magnetic fields, perfect for Arduino projects.
HIGH VOLTAGE CURRENT TOLERANCE - Handles up to 300V and 0.55A, ensuring robust performance in diverse electronic applications.
PACK OF 10 FOR PROTOTYPING SCALING - Bulk pack lets you experiment, iterate, and deploy multiple sensors without running out.

This pack of 10 normally open reed switches offers high sensitivity magnetic activation with a compact 45mm form factor. Rated for up to 300V and 0.55A, these glass-encased switches are ideal for Arduino and microcontroller projects requiring reliable electromagnetic sensing. Their durable design and bulk packaging make them a must-have for prototyping and scalable electronic solutions.

Specifications

ASIN	B01NBPDU04
Best Sellers Rank	#374,419 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #91 in Reed Switches
Brand Name	Cylewet
Circuit Type	1-way
Compatible Devices	Arduino, Raspberry Pi, other microcontrollers, and any device requiring a normally open switch with the specified ratings
Connectivity Protocol	X-10
Connector Type	Screw Terminals
Contact Material	Glass
Contact Type	Normally Open
Control Method	Sensor
Control Type	Magnetic
Current Rating	0.55 A
Customer Reviews	4.3 4.3 out of 5 stars (348)
International Protection Rating	IP54
Item Weight	0.01 kg
Manufacturer	Qianxin
Material Type	Glass
Model	CYT1004
Mounting Type	DIN Rail Mount
Number of Items	10
Number of Positions	10
Operating Voltage	300 volts
Operation Mode	ON-OFF
Part Number	CYT1004
Switch Type	Reed Switch (Normally Open)
Terminal	Through Hole
UPC	751940149006 717850057640
Unit Count	10 Count
Upper Temperature Rating	185 °F
Wattage	10 watts

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