• Normally Open (NO) Magnetic Contact
• Designed for Alarm & Security Systems
• Durable ABS Plastic Housing
• Reliable Magnetic Detection
• Surface Mount Easy Installation
• Compatible with Most Alarm Panels
The DH-31 Door Contact (NO) is a magnetic sensor used in security and alarm systems to monitor the opening and closing of doors or windows.
This model works on Normally Open (NO) configuration, meaning the circuit remains open when the magnet is near the sensor and closes when the magnet moves away.
The device consists of two parts: a magnetic reed switch and a magnet. When the door opens and the magnet separates from the sensor, the circuit closes and can trigger an alarm or signal to the control panel.
The DH-31 sensor is commonly used in home security systems, burglar alarms, access control systems, and commercial security installations.
Its compact and durable ABS plastic design allows easy installation on wooden, metal, and aluminum doors or windows.
Product Type: Magnetic Door Contact Sensor
Model: DH-31
Contact Type: NO (Normally Open)
Operating Voltage: Up to 100V DC/AC
Max Switching Current: 0.5A
Max Power Load: 10W
Operating Gap: 15–25 mm
Material: ABS Plastic
Connection Type: Wired (2 Wire)
Installation Type: Surface Mount
Usage: Indoor
Application: Alarm & Security Systems
Home Security Systems
Burglar Alarm Systems
Access Control Systems
Office Doors
Windows Security
Warehouses
Commercial Buildings
Smart Alarm Installations
Q1: What does NO mean in door contact?
NO means Normally Open – the circuit closes when the magnet moves away from the sensor.
Q2: Can it be used for windows?
Yes, it can be installed on both doors and windows.
Q3: Is it compatible with alarm systems?
Yes, it works with most wired alarm panels.
Q4: Is installation difficult?
No, it can be easily mounted with screws on the door and frame.
Q5: What material is the sensor made from?
It is made from durable ABS plastic.
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