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MAGNASPHERE security sensors' magnet 
ball contact is open in the secure position 
(Open Loop) when the door is closed and 
the door magnet is near the switch.

MAGNASPHERE Security Sensors are Open 
Loop and highly resistant to contact welding 
from power surges and lightning strikes.

A defeat magnet 
introduced OUTSIDE 
the door will have no 
effect on the ball 
contact. When the 
door is opened, the 
contact will close, 
and the 

SYSTEM 

WILL ALARM.

Because the magnet 
ball contact will not 
weld, when the door 
is opened the 
contact will close 
and the 

SYSTEM 

WILL ALARM.

MAGNASPHERE’s contact is a spherical 
magnet and operates in a defined activation 
zone directed toward the door magnet. 

The patented, award-winning MAGNASPHERE switch technology was designed as

a security device which over comes the deficiencies of reed contacts.

 

The MAGNASPHERE 

switch is (1) 

Resistant to magnetic defeat and tamper,

 (2) 

Resistant to permanent contact welding

 from lightning 

and power surges, and (3) Robust, all metal welded construction is 

virtually unbreakable.

www.MAGNASPHERE.com

© MAGNASPHERE CORP.

MAGNASPHERE

®

®

Reed vs.

 The Door is Closed

OPEN

SECURE:  NO ALARM

 The Door is Closed

OPEN

NO ALARM

ALARM

 The Door is Open

CLOSED

Def

ea

t

M

ag

net 

ALARM

 The Door is Open

CLOSED

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