Device Type: Wired Iron Door Magnetic Contact (Heavy-Duty Metal Sensor)
Model / SKU: ARD312 (also listed as DHI-ARD312)
Brand: Dahua
Series: ARD300 Series
Contact Type: 1 × NC (Normally Closed) Relay Output
Electrical Rating: 100 VDC, Max. 500 mA
Power Requirement: None — Passive Operation (No External Power Supply Required)
Detection / Movement Distance: ≥ 35 mm (1.38")
Detection Gap: Up to 40 mm (per some regional listings)
Sensor Technology: Reed Switch (Magnetic) — Specifically Designed for Iron / Metal Doors
Installation: Surface Mount
Casing Material: Metal Plating (Heavy-Duty, Superior Hardness)
Appearance Colour: Silver Grey
Anti-Corrosion Level: Basic Protection
Physical:- Product Dimensions (L×W×H): 18.0 mm × 10.0 mm × 50.0 mm (0.71" × 0.39" × 1.97")
- Net Weight: 54 g (0.12 lb)
- Gross Weight: 56.7 g (0.13 lb)
- Packaging Dimensions: 55.0 mm × 25.0 mm × 70.0 mm (L×W×H)
Environmental:- Operating Temperature: –10°C to +55°C (+14°F to +131°F)
- Operating Humidity: 10%–90% RH
- Storage Temperature: –10°C to +55°C
- Storage Humidity: 10%–90% RH
Certifications: CE
Package Contents: 1 × Magnetic Contact Unit; 1 × Magnet; 1 × Set of Mounting Screws; 1 × User Manual
Key Specs: Dahua ARD312 Wired Iron Door Contact, Heavy-Duty Metal Plating, NC Relay Output (100 VDC / 500 mA), Detection Distance ≥ 35 mm, Passive Operation (No Power Required), Surface Mount, Silver Grey, 18×10×50 mm, 54 g, –10°C to +55°C Operating Temperature, CE Certified, for Iron / Metal Doors and Windows
Usage: Iron Door Monitoring, Industrial & Commercial Security, Banks & Offices, Retail Shops, Warehouses, Residential Door & Window Protection, Access Control Integration, and Any Wired Alarm System Requiring a Durable Magnetic Contact for Metal Surfaces
