• Normally Closed (NC) Magnetic Contact
• Recessed Hidden Installation Design
• Reliable Magnetic Reed Switch Technology
• Durable ABS Plastic Housing
• Designed for Alarm & Security Systems
• Suitable for Doors & Windows
The DH-35 Recessed Door Contact Sensor (NC) is a wired magnetic security sensor designed to detect door or window openings in alarm and security systems.
This model uses a magnetic reed switch and magnet pair. When the door is closed, the magnet keeps the circuit closed. When the door opens and the magnet moves away, the circuit breaks and sends a signal to the alarm panel. Magnetic reed switches are commonly used in security systems because they reliably change electrical contact when a magnetic field is removed.
The recessed installation design allows the sensor and magnet to be hidden inside the door frame, making the system more secure and visually discreet. Recessed magnetic contacts are widely used in alarm and access control systems where a clean installation is preferred.
The DH-35 sensor is ideal for wooden doors, windows, cabinets, and entry points in residential and commercial security installations.
Product Type: Recessed Magnetic Door Contact Sensor
Model: DH-35
Contact Type: NC (Normally Closed)
Operating Voltage: Up to 100V DC/AC
Max Switching Current: 0.5A
Max Power Load: 10W
Detection Gap: Approx. 10–20 mm
Material: ABS Plastic
Connection Type: Wired
Installation Type: Recessed / Flush Mount
Color: White
Application: Alarm & Security Systems
Home Security Systems
Burglar Alarm Systems
Office Doors
Window Security
Warehouses
Commercial Buildings
Access Control Systems
Smart Alarm Installations
Q1: What does NC mean in door contact sensors?
NC means Normally Closed — the circuit stays closed when the door is shut.
Q2: What is a recessed door contact sensor?
It is installed inside the door frame so the sensor remains hidden.
Q3: Can it be used on windows?
Yes, it works for both doors and windows.
Q4: Is it compatible with alarm systems?
Yes, it works with most wired burglar alarm panels.
Q5: Is installation difficult?
A small hole must be drilled in the door frame for recessed installation.
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