Surface mounted Door contact magnetic switch door contact magnetic switch

Surface mounted Door contact magnetic switch door contact magnetic switch        Product Description  surface mount magnetic contact is ideal for residential and commercial applications where terminal connects are preferred.The screws have combination heads that accept either Phillips or flat blade drivers. The terminals are angled away from the mounting surface to allow for quick and easy installation. Snap-on covers conceal the terminals and mounting screws for a clean professional appearance. Wide gap, SPDT, and high security models are available.   IMPORTANT: Align contact and magnet as directed on magnet base (switches are polarity sensitive). Attach contact and magnet to surface. Wire leads to terminals. Snap on cover.   Housing: ABS material ; fireproof ABS housing is available on request Color :white/brown/black Gap: 15-25mm;20-25mm Screw terminal connect surface Note:  1. NC--- here means normally closed. When the door is closed,  the contact of sensor is also closed. If a thief  opens the door,  the contact of sensor will be open , then the   alarm will receive  the  signal.  2. NO--- here means normally open. When the door  is closed ,the contact of the sensor will be open. If a thief opens the door , then the contact of sensor will be changed to closed , stimulating  the alarm to work.  3. COM---here means both normally closed and normally open . The contacts of sensor  can be changed each other .