Nascom - N1175W/ST - Recessed 3/8\ Mini Stubby Press Fit Switch/Magnet Set, Wire Leads (10 Pack)
10 Brown ABS Normally Open Door Contact Switch.
Will make Sense Door Closer at Roughly ¾” or 15mm.
This Contact Works with Any Access Control or Burglar Alarm System Available.
NORMALLY OPEN: When the door or window is open, the contact will give an closed signal and when the door is closed the contact will give a open (circuit) signal..
QMseller MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch 2 Sets
Work as an anti-theft alarm, ideal for metal door and window.
NC means Normally Closed:When the magnet together, the circuit is conductive( light on ).
when the magnet separate, the circuit is not conductive ( light off ).
These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system.
GDQLCNXB 2 Sets MC-33C Normally Closed Recessed Window Door Contact Sensor Alarm Magnetic Reed Switch
3.NC means Normally Closed:When the magnet together, the circuit is conductive( light on ).
when the magnet separate, the circuit is not conductive ( light off ).
4.Work as an anti-theft alarm, ideal for metal door and window.
5.These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system.