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> New security, surface magnetic switch normally closed
New security, surface magnetic switch normally closed
Surface Mount Magnetic Contact Switches, Normally Closed
The most basic sensors of any alarm system are the door and window Surface Mount Magnetic Contact Switches. There are 10 pairs of switches included in this kit allowing you to monitor multiple areas around your home. This type of contact switch is for normally closed circuits; this means that the when the magnets are lined up, the switch is closed. This type of setup is ideal for monitoring doors, windows, and sliding doors. Measuring 2.48" long and half an inch high, they attach with wood or sheet metal screws (not included) to the frame of the door or window and the case or jam.
