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Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
MSS200-7: 3/4″ Recessed Balanced Magnetic Switch - Flair Electronics
Amazon.com: UHPPOTE Normal Closed Wired Screw-Terminal Surface-Mount Magnetic Contact for Window Door Security (Pack of 5) : Electronics
Amazon.com: Wired Metal Door Window Magnetic Contact Sensor Detector Switch Alarm Home Garage Security Kit : Tools & Home Improvement
Amazon.com: 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 : Electronics
Amazon.com: 2 PCS Magnetic Contact Switch, Icstation Magnetic Reed Switch Normally Open Door Reed Switch MC-38 Wired Security Window Door Contact Sensor Alarm : Electronics
Honeywell 940 - Magnetic Door Contact and Window Contact - Alarm Grid
Indoor Magnetic Contact Sensors | ControlByWeb
Contact Sensors
Seco-Larm Magnetic Contact | Overhead Door Magnetic Contact
7939WG Magnetic Contact | Contact Sensors | Sensors | Contact Sensors | Honeywell Building Solutions
PFC48-1, PFC41-1 and PFC42-1: 3/4″ Recessed Magnetic Contact Series - Flair Electronics
Magnetic Contacts - Normally Open - Smartenit
Magnetic contact switch (door sensor), COM-13247 - Antratek Electronics
ATEX Magnetic Door Contacts | Hazardous Area Zone 1 & 2 Door Contact
ADEMCO Magnetic Contact | Contact Sensors | Intrusion Sensors | Access & Intrusion | Contact Sensors | Honeywell Building Solutions
Miniature Magnetic Contact Switch BR-2023 - 3562_0 at Phidgets
PFC40: 3/4″ Recessed Magnetic Contact - Flair Electronics
SIDE MAGNETIC CONTACT KN-02 - Magnetic Contacts - Delta
Honeywell 945T - Mini Surface Mount Magnetic Contact with Screw Terminals - Alarm Grid
What is a Magnetic Contactor? - Principle, Types, Advantages
EMPS Magnetic Contact | Contact Sensors | Sensors | Contact Sensors | Honeywell Building Solutions
Honeywell 943WG - Mini Magnetic Contact - Alarm Grid