What is a Magnetic Contactor? - Principle, Types, Advantages
Magnetic field - Wikipedia
GE Security 1076D-G Recessed Magnetic Contact for Steel Doors, DPDT - Steel Gray
Aritech Access Control Accessories | Door Openers, Door Closers, Door Holders, Breakglass Detectors
350LBS Electric Magnetic Door Lock, 180Kg Electromagnetic Electronic Magnetic Force Door Lock for Access Control Single Door DC12V Fail Safe NC Type - Amazon.com
PRODUCTS
Onarway Magnetic Door Catch 40 lbs Pull Strong Magnet Cabinet Latches Magnetic Hardware Stainless Steel Chrome Door Closer for Bathroom Kitchen Sliding Door Window Cupboard (4 Pack-Strength 20KG) - Amazon.com
Edwards Signaling 1076D-G Recessed Steel Door Magnetic Contact with Wire Leads, 1" Diameter, DPDT, 1/2" Gap Size, Double Pole-Double Throw, Gray
Magnetic Contacts - Flair Electronics
Using a Magnetic Switch - Protected by Python! – Firia Labs
How to install a magnetic door contact | Reed switch - YouTube
Magnetic field
Electriduct Wire Python Magnetic Wire Pulling Device
Magnetism - Magnetic Fields, Forces, & Materials | Britannica
Door stop, Magnetic, pull approx. 4 kg - in the Häfele America Shop