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When the magnet together, the circuit is conductive( light on ); when the magnet separate, the circuit is not conductive ( light off ).
For example: Install on the door, close door light on. open door light off.

Specification:

• Working Principle: Magnetic is composed of two parts:a part is permanent magnet and other part is a normally
  reed switch,when permanent magnet close reed switch(less 5mm), magnetic sensor is working station(short circuit). when magnet separate,it is normal open state.
• Metals shield anti-fire ABS
• Connecting mode: NC
• Detected objects: Magnet
• Rated current : 300(mA)
• Rated voltage MAX: DC 6-30V  ,AC 220V
  
• Qperating distance: 15-20mm.
• Power: 10W
• Color: Brown
• Dimension:19*25mm(DxL)
• Application:access control ,alarm system

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