10pcs HC-34A NC Recessed Wired Gate Contact Sensor Alarm Magnetic Reed Switch Wheel Handles security data signal transmission

security data signal transmission

Air Pneumatic manifold is the starting points for air cylinder systems

Rotary Knob Size: 15 x 27mm/0

Thermostat is wired as a normally close circuit that closes when turn-on temp is reached

LCD repair

10pcs HC-34A NC Recessed Wired Gate Contact Sensor Alarm Magnetic Reed Switch Wheel Handles security data signal transmissionDescription: 1. 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 ). When make order,pls check carefully! 2. 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. 3. Work as an anti theft alarm, perfect for metal door and window.